Engine is a basic production V-8, overhead valve, naturally aspirated engine. Turbocharging and/or

supercharging is prohibited.

2.23.1.1: BLOCK

The engine block must be of the manufacturer's production or an SCCA Pro Racing approved heavy-duty version. Engines may be bored and/or sleeved. Crankshaft main bearing caps may be substituted. No angled machining of deck surface allowed. Deck must be perpendicular to cylinder bore. Aluminum engine blocks are prohibited for 2-valve per cylinder engines. 4-valve per cylinder engines must use the same block material as the production engine (cast iron or aluminum only). Use of an aluminum block will require the competitor to bolt 25 lbs of ballast on each side of the engine on top of the lower frame rails (50 lbs total). In all cases the following standard dimensions must be maintained.

• Camshaft location.

• Cylinder bore spacing.

• Bank angle.

• Crankshaft centerline to deck face.

2.23.1.2: CRANKSHAFT

The crankshaft is unrestricted provided the angles of the crank throws remain the same as the production crankshaft, and the engine firing order remains unchanged.

2.23.1.3: CONNECTING RODS

The connecting rods are unrestricted provided they are made of steel (ferrous) material. Titanium, aluminum, graphite, etc., connecting rods are prohibited.

2.23.1.4: PISTONS

Any aluminum alloy piston may be used.

2.23.1.5: LIGHTENING, BALANCING, AND MODIFYING

It is permitted to lighten, balance, or modify components of the engine and drive train.

2.23.1.6: CYLINDER HEAD

The cylinder heads must be of the manufacturer's production or an SCCA Pro Racing approved heavy-duty version. Material(s) may only be added to the combustion chamber and interior ports/passages. The addition of such material(s) shall not enable the combustion chamber or ports/passages to be moved external to the original physical limitations of the cylinder head casting. Valve angles may not be altered more than 1.00 degree from the approved cylinder head configuration. Alternate cylinder heads must maintain the following production dimensions. See list of approved alternate cylinder heads in Appendix 2.B.

• Number of intake and exhaust ports.

• Number of intake and exhaust valves.

• Method of valve actuation.

• Port spacing.

• Method of cooling.

2.23.1.7: CAMSHAFT

Any camshaft may be used providing the standard firing order remains. Any cam followers may be used. Any rocker arms and rocker arm supports may be used. Camshaft operation may not include any mechanism to vary valve timing.

2.23.1.8: VALVE SPRINGS

Valve springs must be conventional steel coil springs. Any number of concentric springs allowed per valve. No pneumatic or hydraulic means of retaining the valve against the seat allowed. No titanium valve springs.

2.23.1.9: SUMPS AND PUMPS

The use of any dry sump oil pan (sump) and oil pump is allowed. The oil pump must be driven mechanically by the engine. Dry sump systems are required. All parts of the oil pump and oil pump drive must be within 18.00" of the front of the engine block. The oil pan (sump) may not be more than 2.00 inches wider than the engine block oil pan rails. Metal bulkheads must isolate the tank so that in case of spillage or failure, oil will not reach the driver.

2.23.1.9.1: The water pump may be replaced with any direct replacement water pump.

The cooling fan may be modified, substituted, or removed.

2.23.1.9.2: Alternator, crankshaft, and water pump pulleys are unrestricted. The use of

any crankshaft vibration dampener is allowed.

2.23.1.10: VENTS AND BREATHERS

The installation of any vent or breather on the engine, transmission, or differential is permitted. Crankcase vacuum devices are prohibited.

2.23.1.11: FILTERS

Any oil filter(s) may be used.

2.23.1.12: INDUCTION

All competitors must declare, per SCCA Pro Racing declaration form, their induction system type (carburetor or fuel injection) at the time their car is presented for pre-event technical inspection. Any change in induction system type following declaration will result in forfeiture of the competitor’s qualifying time, and the competitor must start the race from the back of the grid.

2.23.1.12.1: INTAKE MANIFOLD

Engine intake manifolds, carbureted or fuel injected, must be SCCA Pro Racing approved and available to anyone. Material must be cast aluminum or magnesium. Drag race tunnel rams are prohibited. One front intake manifold bolt on each side of the engine must be cross-drilled with a minimum 0.060 inch diameter hole to facilitate attachment of SCCA Pro Racing seals.

2.23.1.12.2: CARBURETORS AND SPACERS

External dimensions of the carburetor may not be altered. All inducted air must pass through the throttle venturi(s). Modifications to allow additional air to be picked up below the opening of the venturi, such as altered gaskets, base plates, or drilling holes into the carburetor shall not be permitted. A one (1) piece spacer, maximum thickness of 1.50 inches and acceptable to SCCA Pro Racing officials, may be installed between the intake manifold and the carburetor. Only two (2) paper gaskets (one per side), maximum 0.065 inch thick, will be permitted. Gaskets may only be altered to match carburetor base openings. The front, passenger side carburetor stud must be cross-drilled with a minimum 0.060-inch diameter hole to facilitate attachment of SCCA Pro Racing seal.

2.23.1.12.2.1: Pushrod 311 cu. in. engines, if carbureted, must utilize Holley model 4150 with maximum throttle bore diameter of 1.6875 inches.

 2.23.1.12.2.2: 358 cu. in. and 335 cu. in. engines must utilize Holley part number 80540-1 carburetor with the following limitations: Maximum throttle bore diameter

1.563 inches. Maximum venturi diameter 1.254 inches.

2.23.1.12.3: FUEL INJECTION

Fuel injection may be used only on 275 cid 4-valve engines or 311 cid 2-valve engines.

2.23.1.12.3.1: Manifolds for fuel injection must use butterfly throttle control (no slide

throttles or radial throttles). Maximum of eight (8) throttle butterflies allowed. Maximum of eight (8) injectors allowed. All injectors must be mounted in the intake manifold or airbox. Variable length inlet systems are prohibited. All inducted air must pass through the throttle butterflies. 

2.23.1.12.3.2: All competitors using fuel injection must run the SCCA Pro Racing specified engine management system produced by EFI Technology (Part Number 50-019 or 50-020). No hardware modifications allowed to Engine Control Unit (ECU) or harnesses. Engine management software may not be altered except to tune fuel curve map. SCCA Pro Racing reserves the right to inspect all aspects of engine management system hardware and software at any time. The only sensors allowed for use with the engine management system are those produced by EFI Technology specifically for use in the Trans-Am Series. The only allowed sensors are: throttle position, air temperature, oil temperature, water temperature, manifold air pressure, fuel pressure, oil pressure, crank position, camshaft position, and one (1) lambda air:fuel ratio sensor. Due to the data acquisition capabilities of the Engine Management System, teams using fuel injection are not eligible for the weight reduction allowed for running without data acquisition.

2.23.1.12.4: ENGINE AIR INLET

Engine air may be ducted through an opening in the back of the hood (cowl induction) or ducted from the radiator air plenum (ram air) only.

2.23.1.12.4.1: If using cowl induction, air may only be ducted to the engine air box through an opening in the back of the hood, rectangular in shape, with a maximum dimension of 20.00 inches wide by 3.50 inches. The cowl inlet opening must be level front to rear with a maximum tolerance of 0.25 inch.

2.23.1.12.4.2: On approved, 1995 and later Camaro and 1994 - 2000 Mustang bodywork, the cowl inlet opening may extend one inch (1") into the windshield. On approved 1995 and later Camaro bodywork, the rear edge of the air intake opening must be a minimum of 32.5" from the top edge of the windshield opening (indentation) in the roof panel. On approved 1995 and later Mustang bodywork, the rear edge of the air intake opening must be a minimum of 26.5" from the top edge of the windshield opening (indentation) in the roof panel.

If using ram air, engine air may be ducted from the radiator air plenum, forward of the radiator, to the engine air box. Engine duct may join the radiator plenum at any location aft of the bodywork, but may not have any dedicated, forward facing ductwork or air vanes inside the radiator plenum.

2.23.1.12.5: THROTTLE LINKAGE

Any mechanical throttle linkage may be used, but it must be direct acting and equipped with two (2) external return springs.

2.23.1.12.6: WATER INJECTION

The injection of water, coolants, or oxygen-bearing compounds into the intake or fuel system is prohibited.

2.23.1.12.7: AIR FILTERS

An air filter is required on all engines.

2.23.1.13: COOLING SYSTEM

2.23.1.13.1: The use of any engine, transmission, and differential oil cooler(s) is permitted, provided it/they are not in the driver/passenger compartment. Associated oil cooler pumps and lines are permitted for the transmission and differential. 2.23.1.13.2: The use of only a single, front-mounted, standard size water radiator is permitted. Full-width radiators are prohibited. Separate expansion or header tanks are permitted, provided they are mounted in the engine compartment. Radiator overflow lines must terminate onto the exhaust system. Sealing or shrouding the airflow area between the normal grill opening and the water radiator is permitted. Ducting of airflow aft of the radiator is prohibited.

2.23.2.1: Only SCCA Pro Racing approved, multi-disc clutch and flywheel may be used (AP Racing, Quarter Master, and Tilton style). Minimum clutch diameter is 4.50 inches. No fluid or torque sensing couplings allowed. 

2.23.2.2: Only SCCA Pro Racing approved readily available manual transmissions having no more than five (5) forward speeds and a working reverse may be used (see Appendix 2.B.4.1). Any non-sequential, mechanical shift linkage may be used. The front mounting surface of the transmission must be within thirteen and one-half inches (13.50") of the back of the engine block.

2.23.2.3: Effective 1/1/2002, vehicles using a Hewland ST gearbox with narrow gears (any gear less than 0.900 inch wide) must add twenty-five (25) pounds to the minimum vehicle weight.

2.23.2.4: Hydraulic or mechanical clutch linkage only may be used. 

2.23.2.5: Competitors using a 335 or 358 cu. in. engine that choose to use an SCCA Pro Racing approved 4-speed transmission (see Appendix 2.B.4.2) on a standard bellhousing (no spacers or long input shaft) may deduct fifty (50) lbs. from the minimum vehicle weight.

A heavy-duty driveshaft is required. A minimum of two (2) steel 360-degree "loops" are required, located within twelve inches (12") of the front and as close as practical to the rear universal joint to contain the driveshaft in the event of u-joint and/or driveshaft failure.

Axle housings shall be either Ford 9-inch or Frankland type. Only live, solid-axle rear-end housing allowed. No aluminum tube axle housing permitted. Any gear ratio may be used. Only Detroit locker differentials or spools will be permitted. Final drive units that permit ratio changes while the car is in motion are prohibited.

Engine must be located along the centerline of the vehicle as defined by the track, +/- 1.00-inch. The rear of the engine block may be positioned a maximum dimension of 19.125 inches rear of the front axle centerline. Minimum allowable crankshaft centerline to ground is seven and one-half inches (7.500"). Engine may only be attached to chassis using one (1) front engine plate and one (1) rear engine/bellhousing plate. No other engine to chassis attachments permitted.

The intent of the following rules is to maintain the recognizable external features of the manufacturer's make and model while providing for necessary safety and performance modifications.

2.24.1.1: Any element, assembly, or function of the vehicle that produces or has an aerodynamic "ground effect" is prohibited.

2.24.1.2: FRAME

Chassis configuration will be full-frame, providing all suspension mounting points, front engine, rear-wheel drive, and front-wheel steering. The chassis must be completely constructed of steel tubing. The use of monocoque or semi-monocoque construction is prohibited. The chassis must incorporate a full roll cage, including side door bars, in accordance with SCCA Pro Racing Appendix Z and as specified in 24.2.1 and 24.2.2. All frames must have a permanent tag attached to identify the original chassis constructor, chassis number, and month and year of construction. Chassis tag to be located in the dash area of the drivers’ compartment.

2.24.1.2.1: Cars constructed after 6/1/90 must have main frame rails of steel box tubing, minimum 1-3/4 x 1-3/4 inches by 0.095 inch wall thickness. Main frame rails include the lower, outboard frame rails between the firewall and rear bulkhead, the lower cross-car frame rail in the rear bulkhead, and the outboard vertical tubes in the rear bulkhead that support the main roll hoop. The vertical tubes supporting the main roll hoop in the rear bulkhead may also be made of 1-3/4 inch diameter by 0.095 inch wall round tube.

2.24.1.3: WHEELBASE

Standard Trans-Am series wheelbase is 102". Effective 1/1/94 all new cars registered with the Trans-Am series must have 102" ± 0.50 inch wheelbase.

2.24.1.4: TRACK/CAR WIDTH

Maximum overall car width is 80.00 inches. OEM side view mirrors as required on 2001 style bodywork must match the production car width and may exceed 80.00 inches.

2.24.1.5: FLOORS

The floor in the driver/passenger compartment must remain flat and horizontal, relative to the car and rocker panels. It may not be curved, angled or recessed and must be made of steel and/or aluminum only. On the passenger side of the compartment, the floor may be raised up to ten inches (10"), or a secondary floor installed at that level, to accommodate the exhaust system.

2.24.1.5.1: The driver/passenger compartment floor shall cover the area from the forward fire wall, the full width between the rocker panel to drive-shaft tunnel, panels extending no further aft than the forward-most point of the rear wheel opening. Floor panels aft of this point to the rear-most point of the rear wheel opening are prohibited. Floor panels forward of the engine bay fire wall are prohibited. Floor panels between the outboard frame rails and the rocker panels may be cut out or removed. If utilized, floor panels between the outboard frame rails and rocker panels must form a single, continuous surface with the passenger compartment floor (inboard surface flush with bottom of frame rails, outboard surface flush with bottom of rocker panels). 

2.24.1.5.2: The fuel cell bottom and/or floor behind the rear wheel opening shall be flat and angled upwards, following, but not exceeding the line of the rear fender bottom.

2.24.1.5.3: Full-width bottom shrouding of the front spoiler/nosebox area (front undertray) is permitted but must be flat and can extend no farther rearward than the center of the engine harmonic balancer. Undertray may not be stepped or curved. Undertray may be angled in side view to produce a maximum height at trailing edge of 3.25 inches above ground when measured without driver and fuel.

2.24.1.6: FIRE WALLS

There must be a fire wall between the engine compartment and driver compartment. It must be made of steel and/or aluminum, must be in approximately the same location as the original. The bulkhead between the outer-door skin and the inner chassis panel may be removed.

2.24.1.7: BULKHEAD

There must be a steel and/or aluminum bulkhead separating the passenger compartment from the compartment containing the fuel cell. A vertical transverse bulkhead behind the driver is permitted provided it allows adequate vision to the rear. This does not negate the need for a metal bulkhead separating the fuel cell from the passenger compartment. 

2.24.1.7.1: All interior panels must be made of steel or aluminum, unless an alternate material has been specifically authorized. Instrument panel and transmission tunnel may be made of alternate material.

2.24.1.7.2: There must be a steel and/or aluminum horizontal bulkhead covering the rear suspension, coolers, ducting, etc., so that when viewed from above these items are not visible. The preferred interior should be paneled off at the back of the rear seat back under the rear window.

2.24.1.8: JACK POINTS

No jack points may protrude through the bodywork.

2.24.1.8.1: The installation of on-board jacking systems is prohibited.

2.24.1.9: TOWING PROVISIONS

2.24.1.9.1: All cars must have at least two (2) permanently-installed towing eyes, one (1) front and one (1) rear, to be used for retrieving and flat-towing the vehicle. These towing eyes must be easily accessible without removal or manipulation of bodywork and must remain within the perimeter of the bodywork as viewed from above. Towing eyes must be of sufficient strength to retrieve car from areas such as gravel traps and other off-course areas. In addition, it is strongly recommended that all cars be equipped with clearly marked lifting eyes attached to both the front and rear upper frame rails to facilitate lifting the vehicle with minimal damage.

2.24.1.9.2: The hood and decklid of the vehicle must be easily and quickly removable to facilitate lifting. Only quick disconnect fasteners such as over-center latches, Dzus and/or Camloc fasteners, and hood pins may be used to retain these panels.

2.24.1.10: EXHAUST SYSTEM

Exhaust header(s), tailpipe(s), may be of unrestricted origin. Exhaust opening(s) must exit to the rear of the wheelbase centerline away from the car, below a line eight inches (8.00 inch) above the bottom of the rocker. Only two (2) exhaust outlets permitted.

2.24.1.10.1: The maximum sound level shall be 107 dba. Cars with no mufflers will not be accepted for competition.

2.24.2: SAFETY ITEMS

2.24.2.1: ROLL CAGE DESIGN AND SPECIFICATIONS

All vehicles must have a full steel roll cage, including side door bars, built in accordance with Appendix Z and these regulations. The roll cage must be a fully welded, integral part of the chassis. Carbon fiber, composite-type materials are not permitted in any structural components. All Trans-Am cars must meet the 2500-lb. roll cage tubing size requirements of Appendix Z.

2.24.2.2: SIDE PROTECTION

2.24.2.2.1: Driver's side NASCAR-style door bars are required. All tubing must be 1.50- inch minimum diameter by 0.083-inch minimum wall thickness. There must be at least three (3) horizontal side tubes and three (3) equally spaced upright tubes. There must also be an upper horizontal side tube connecting the front and rear roll hoops across the door opening, and at least one diagonal tube connecting the front and rear hoops in the door opening below the upper horizontal tube.

2.24.2.2.2: The minimum passenger side protection shall consist of an upper horizontal side tube connecting the front and rear hoops across the door opening. Additionally, there must also be two (2) diagonal tubes from the front hoop to the rear hoop bisecting one another in the door opening below the horizontal side tube, or not less than three (3) NASCAR-style door bars.

2.24.2.3: DRIVER'S SEAT

The driver's seat shall be a racing-type bucket seat providing lateral support for the torso. Seat mountings must be reinforced, and seat backs must be braced to prevent their failure. The driver's seat must be in the standard location (left side of vehicle, as close as possible to standard front seat location).

2.24.2.4: STEERING

An all-metal quick release coupling on the steering wheel is mandatory. (Pin release or collar release type.) Only rack and pinion-type steering is allowed. A collapsible type of steering column is required. The front wheels only may be steered by the driver.

2.24.2.5: FUEL SYSTEM

A safety fuel cell complying with Appendix X is required. The maximum fuel system capacity for all cars is 32.00 U.S. gallons. The fuel cell must be located behind the rear axle. Proper bracing to protect the fuel cell in the event of rear-end crash is required. 

2.24.2.5.1: For refueling on pit lane, the filler shall be an approved dry-break coupling, positioned in the deck lid, back window, or fender as far rearward as possible. If the filler spout is mounted outside the perimeter of the main frame rails, a minimum of six (6) inches of 2.50 inch maximum inside diameter flex hose must be used between the filler spout and the fuel cell neck. A "flapper" style fuel cell rollover check valve is required. Fuel cell vent hose must be constructed to prevent fuel spillage when the fuel cell is full. The vent line must terminate outside the body. If used, the discriminator valve must not protrude into the driver compartment. Maximum vent hose 1.25 inches I.D.

2.24.2.5.2: FUEL LINES

All fuel lines must be made of metal-braided hose or comparable woven, high performance hose with AN-threaded couplings. Maximum of two (2) fuel lines (one supply, one return) connecting the fuel cell compartment to the engine are permitted.

2.24.2.5.3: FUEL PUMPS

Any fuel pump(s) may be used. The location of the pump(s) is unrestricted except that the fuel pump(s) can not be located in the driver/passenger compartment. Fuel pumps must be connected to the power feed through an inertia cut-off switch (e.g. Ford p/n E1AE-9341-A2B or equivalent) or oil pressure switch to de-activate fuel pumps if the car is exposed to a crash.

2.24.2.6: OTHER SAFETY ITEMS

Consult the applicable SCCA Pro Racing Appendix for regulations concerning: Scattershields, Window Nets (must meet SFI 27.1) Master Switch, Fire Extinguisher, and Driver Restraint Systems.

2.24.2.7: OIL HOSES & LINES

Oil lines shall be made of metal-braided hose or comparable woven, high performance hose with AN-threaded couplings, except lines passing through driver/passenger compartment may be hard lines or metal braided hose or comparable woven, high performance hose. Pumps, coolers, and filters cannot be mounted in driver/passenger compartment.

2.24.3.1: WHEELS

2.24.3.1.1: Material: Steel, aluminum, magnesium, or a combination thereof. Wheels must be of three-piece design (except wide 5 or steel 5X5) consisting of wheel center, outer rim half, and inner rim half, and must use mechanical fasteners (rivets, bolts, etc.). 

2.24.3.1.2: Diameter: 16-inches.

2.24.3.1.3: Width: maximum inner bead-to-bead width is as follows:

Front: twelve inches (12.00").

Rear: thirteen inches (13.00").

2.24.3.2: TIRES

The only tires permitted in the Trans-Am Series will be the BF Goodrich Radial that has been designated as the Series "Spec Tire." These tires will be available in both slick and wetweather configurations.

2.24.3.2.1: Filing, buffing, or any other disguising of the tire sidewall is prohibited. Tire warmers, chemical treatments, hand grooving, or any means to attempt to artificially enhance tire performance is prohibited. Tire pressure bleeders are prohibited. 

2.24.3.2.2: During any qualifying session, the use of coolants or cooling methods other than natural convection or conduction is prohibited. In the event of a wet session, it is permitted to change from full-rain tires to slicks or from slicks to full-rain tires. No other tire changes are permitted.

Suspension shall be coil-over design. Suspension mounting points shall be incorporated in the chassis frame work. Stressed engines are not allowed. Suspension components shall be heavy duty, reinforced, modified for racing design. Hubs, bearings, spindles, axles, u-joints, bushings, ball joints, and rod-ends shall be heavy duty for racing type. Aluminum spindles/uprights or rear axle tubes are not permitted. No carbon fiber or composite suspension components allowed. Driver adjustable shocks and titanium springs are prohibited. Outboard mounting of shocks only. No pushrods, pullrods, rockers, bellcranks, or horizontally mounted shocks are allowed. Only four springs per car are allowed. Springs must be constant rate. No progressive or digressive rate springs are allowed. Bump rubbers are allowed. Any device that permits changing the car's ride height during competition is prohibited. Active suspension systems, driver or computer controlled shocks, (including valving and velocity) tire and/or brake temperature sensors, driven-wheel speed sensors, in-car timing devices, vehicle speedometers, recording tachometers, traction control, ABS braking, and telemetry are specifically prohibited.

2.24.4.1: FRONT SUSPENSION

Only basic coil-over double wishbone-type front suspension is allowed. Each front wheel/upright assembly must be tethered to the main sprung chassis using a stainless steel cable. The cable must be a minimum 0.312-inch diameter wire rope constructed of 7 x 19 stainless steel "aircraft" grade wire. One end of the wire must be finished in a standard Flemish eye mechanical splice secured by a pressed steel sleeve. This end must loop around the upright either below the upper balljoint or above the lower balljoint. The diameter of the eye must be small enough that the cable cannot pass over the balljoint/control arm assembly. The other end of the cable must have a rotary swaged stainless steel eye that is bolted to one of the main frame rails. The cable must be retained by a minimum 7/16-inch diameter solid steel bolt passing completely through the frame rail and retained by a locking nut. A cable constructed from 0.312-inch diameter 12 strand Vectran V-12 fiber may be substituted for the stainless steel wire.

2.24.4.2: REAR SUSPENSION

Only basic-type live solid axle, three or four link, coil-over rear suspension is allowed. (Threelink shall consist of three attachment points on the rear end housing and three attachment points at the chassis. Four link shall consist of four attachment points on the rear end housing and four attachment points on the chassis.) Fore/aft locating links must run parallel to the vehicle centerline, +/- 10 degrees, in plan view. All suspension mounts must be rigid (no bushings, etc.), except forward third link mount may be adjustable in vertical direction only. No driver adjustment of suspension mounts permitted. The only approved rear suspension centering devices are watts link or panhard bar. All suspension control arms must be of a fixed length. Bolt on camber adjustable spindles, aluminum axle tubes, and I.R.S. are not allowed. Spindles may be shimmed to achieve allowed camber. No more than 1.0 degree negative camber on rear wheels is permitted.

Shock absorbers shall be SCCA Pro Racing approved for use in the Trans-Am Series. (See Approval list in Appendix 2.B) Only four shocks per car are allowed. Shocks may have a maximum of one remote reservoir/adjustment canister per shock. If utilized, there must be only one remote reservoir/adjustment canister per shock. (One canister not allowed to perform reservoir/adjustment function for more than one shock.) Shocks may not be interconnected in any way. Maximum of three external adjustment mechanisms permitted. Only mechanical adjustment mechanisms permitted. Driver adjustable or computer controlled shocks are not allowed.

2.24.6: BRAKES

2.24.6.1: Dual master cylinders are required and must be operated by a single brake pedal.

2.24.6.2: A.B.S. brakes are not permitted.

2.24.6.3: Air ducts may be fitted provided they extend in a forward direction only, and no changes are made in the bodywork.

2.24.6.4: Parking brakes are not required.

2.24.6.5: Brake lines must be steel tubing or metal-braided hose. Brake lines must be routed in a manner which allows for visual inspection of the complete brake system. Brake lines may not be routed through frame rails or suspension components. The only devices allowed between the master cylinder and the calipers are a pressure switch for brake lights and a proportioning valve.

2.24.6.6: Only SCCA Pro Racing approved readily available brake discs and calipers may be used. Only one caliper per wheel permitted. Outboard fixed mounting only. Brake caliper "floaters" are not permitted. Maximum brake rotor diameter - 13.125 inches. Maximum brake rotor width - 1.400 inches. Minimum brake rotor width - 0.750 inches. Brake discs must be of cast iron or cast steel material; carbon fiber discs are prohibited.

 2.24.6.7: Water spray cooling systems are permitted. Maximum tank capacity 3 gal. No liquid cooled calipers.

2.24.6.8: Brake fluid recirculators are not permitted.

2.24.6.9: Brake "accumulators" are not permitted.

2.24.6.10: Power assist brakes are not permitted.

One (1) front and one (1) rear anti-roll bar is permitted. Anti-roll bars must be of conventional, torsion bar type design and purpose. If any suspension components extend into the driver/passenger compartment, they must be completely sealed off by metal panels. Mechanical driver adjustment is permitted. No electronic or hydraulic adjustment allowed.

Minimum ground clearance is two and one-half inches (2.50") when measured without driver and fuel. Only Teflon, jabrock or plastic rub blocks are allowed. Titanium or metal rub blocks are prohibited. Rub block maximum size: 8 square inches plan view area by 0.50 inch thick. Rub blocks must be mounted a minimum of six inches (6") apart. Rub blocks that are mounted flush with the surrounding body panel are not subject to the size and spacing limitations. 

ARTICLE 2.25: BODYWORK

The intent of the following rules is to maintain the recognizable external features of the manufacturer's make and model. All bodywork must be SCCA Pro Racing approved. Only bodies built by a SCCA Pro Racing approved body suppliers will be permitted. Bodies shall be marked by the supplier to verify that they are approved bodies. Minimum weights for body parts will be established. Upon approval, body manufacturers shall supply SCCA Pro Racing with all required templates. See Appendix 2.B - Approved Bodywork. All new bodies submitted for approval after 11/1/00 must also meet additional, more production-based design guidelines (available from SCCA Pro Racing Technical Department). Effective 1/1/2003 all cars must be fitted with bodywork meeting the new design guidelines.

All cars shall use a stock, standard original safety glass windshield, or an SCCA Pro Racing approved replacement mounted in the stock location at the stock angle. Polycarbonate windshields must be a minimum of 0.187 inch thick. Three (3) metal windshield safety clips (3" x 1" x .125") shall be bolted or riveted to the body at the top of the windshield. Two (2) clips (same dimensions) shall be bolted or riveted to the cowl and extend over the bottom edge of the windshield. Clips shall be spaced at least twelve inches (12") apart. Polycarbonate windshields may be retained by bolts or quarter turn fasteners. These fasteners must be spaced no more than 12 inches apart along sides and top of windshield, and at least two fasteners must be used along bottom of windshield. 

2.25.1.1: All cars shall have at least three (3) inner windshield supports to prevent the windshield from collapsing inward. These supports shall be 3/4" x .125" minimum straps of aluminum. Spacing between inner supports shall be eight inches (8") minimum.

2.25.1.2: Rear quarter and rear windows shall be made of clear polycarbonate plastic having

a minimum thickness of 0.125" and retain the same shape, size, and location as the original

glass. The rear window shall be secured by two (2) additional metal straps (1" wide x .125"

thick), bolted or riveted to the body at both the top and bottom of the rear window.

2.25.1.3: Driver and passenger door window glass or plastic is not permitted.

2.25.1.4: Approved rain windows must be made of clear polycarbonate plastic having a minimum thickness of 0.125 inch. Rain windows may extend from the forward most point of the side window opening to a point no less than 24.00 inches forward of the B-pillar. Rain windows must be flat except for a maximum 0.250-inch gurney along the rearward edge. Rain windows may only be installed in conjunction with rain tires, but may remain on the vehicle through the completion of the session or race, even if rain tires are removed. 

Two (2) operating brake lights and two (2) operating taillights are required. All cars must have original taillight and brake light lenses.

All cars shall have rearview mirrors. An interior mirror and outside driver's side mirror are required; an outside passenger's side mirror is recommended. All cars using new, 2001 style bodywork must be fitted with the OEM driver and passenger side view mirrors, or an approved replica, in the production location.

The external shape of the body cannot be changed except when specifically authorized. 

2.25.4.1: The original roof line and front and back window angle must be maintained. The original silhouette (grill to hood to front windshield to roof and back glass to deck lid) must be maintained. Minimum roof height is listed in Appendix 2.A.

2.25.4.2: Original front and rear overhang shall be maintained or be as specifically authorized.

2.25.4.3: Templates will be used to check body profiles. Duplicate templates will be available to competitors from a source established by SCCA Pro Racing.

Fenders shall not confuse the identity of the car. The flares shall completely cover the tires when viewed from above.

Doors shall be pinned or positively fastened. Standard door hinges and latch mechanisms are not allowed. Doors shall be removable.

2.25.6.1: Driver and passenger door window glass or plastic is not permitted. Inside door handles, door panels, window cranks and mechanisms, and other interior trim pieces are not allowed.

2.25.6.2: Outer edge of rocker panels shall be parallel to vehicle centerline. Maximum deviation permitted is 1.00 inch per side.

The SCCA Pro Racing approved front nose-piece including front spoiler shall be used. Glass headlights, front parking lights, front signal lights, lenses and bulbs, and other front lighting parts and ancillaries are not allowed. Nose-piece must be equipped with paint or decals that accurately depict the production headlights and signal lights.

The front spoiler shall be approved by SCCA Pro Racing. The spoiler, upon approval, shall be documented with templates and dimensions for verification thereafter. 

2.25.8.1: The spoiler shall blend with the general lines of the car, and not confuse the identity of the car. Openings are permitted in the front spoiler for the purpose of ducting air to the brakes and/or coolers.

The hood must be retained by at least two (2) hood pins securely mounted to the chassis or noseframe. The hood pins must be located no less than 12 inches and no more than 24 inches behind the leading edge of the front spoiler. The hood pins must be 0.375-inch diameter steel. The hood panel must be reinforced around the hood pin using a minimum 1.50-inch diameter steel plate.

2.25.10.1.1: The only approved rear wing for all vehicles is one unmodified singleelement Liebeck airfoil #1LD104E scaled to a chord length of 10.75 inches. The only approved suppliers are Fabcar (part #LAF104TA), Derhaag Motorsports (part # TAW1), KFC (part #KFC485), and Hoerr Racing (HR 120-TA). The maximum cross-sectional tolerance of the wing profile is 0.060 inch. 

2.25.10.1.2: A maximum 0.50-inch Gurney tab is allowed at the trailing edge of the wing element. The tab must be mounted 90 degrees to the upper wing surface. No air may pass between the tab and the wing.

2.25.10.1.3: The wing endplates must fit within a rectangle measuring 11.00 inches long by 4.00 inches tall. No portion of the wing element or tab may extend beyond the perimeter of the endplate. The endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the ground. Endplates must be flat, with no curvature or gurney tabs.

2.25.10.1.4: The maximum width of the entire wing assembly (wing element, endplates, and mounting hardware) is 72.00 inches.

2.25.10.1.5: The entire wing assembly must be mounted at least 2.00 inches below the peak of the roof (measured at vehicle centerline). Alternate roof to wing dimensions may be listed in Appendix 2.A-2. The trailing edge of the wing assembly may be no further rearward than the rearmost part of the bodywork, and no further forward than a point six (6.00) inches forward of the rearmost part of the bodywork. The wing must be rigidly mounted to the sprung part of the chassis. Two wing mounting posts must be utilized, and each must be between 16.00 inches and 20.00 inches inboard from the ends of the wing. The recommended mounting posts are 0.250 inch thick 6061-T6 aluminum with a minimum section width of 4.00 inches. Alternative mounting posts must be approved by the Technical Administrator. The wing must be centered about the vehicle centerline.

2.25.10.1.6: The wing angle may not exceed thirty (30) degrees from horizontal. The wing angle must be firmly fixed while the vehicle is in motion. Cockpit adjustable wings and flexible wing mounts are specifically prohibited.

2.25.10.1.7: The rear decklid may be slotted only as necessary to facilitate removal of bodywork with the wing mounted to the chassis.

2.25.10.2: Roof to deck lid dimensions: The minimum roof to deck lid dimension measured along the vehicle centerline shall be 12.00 inches. Alternate roof to deck lid dimensions may be listed in Appendix 2.A-2.

2.25.11: DUCTING

Air ducts or other openings may not be added to body parts, except where specifically authorized (i.e. front spoiler, NACA duct in quarter window). Fresh-air ducts to the driver may be added to the A-pillar so long as they are separate parts from the bodywork. A clear NACA duct may be installed in the left and/or right side window opening at the A-pillar. These ducts and the surrounding panel and supports must not exceed 6 inches in height by 10 inches in length, and the inlet must remain open at all times. Air to the rear brakes and coolers may be ducted from the B-pillar return flange or the area inboard of the B-pillar, or from free air under the car.

2.25.12: MATERIALS

All body panels shall be constructed of composite materials. All nose, door, and rear bumper panels manufactured after 1/1/01 shall incorporate a layer of Kevlar to minimize fracturing due to crash damage.

Only standard race car-type analog gauges allowed. Digital/electronic gauges or dashboards are prohibited. The only gauges allowed are: engine r.p.m., oil pressure, water temperature, oil temperature, volt meter, fuel pressure, gearbox temperature, and rear end temperature.

2.26.2: IGNITION SYSTEM

2.26.2.1: Only SCCA Pro Racing approved distributor and ignition system utilizing a single coil is allowed. Magneto ignition and driver or computer controlled spark timing are prohibited. A backup ignition system is allowed, but only one ignition box and one coil may be operational at one time.

2.26.2.2: The only Approved ignition amplifier boxes are MSD 6T (part number 6400), MSD 6TN (part number 6401), and GM part number 10037378. All boxes must have 4-pin pigtail for installation of MSD Soft Touch rev-limiter. All ignition boxes must have clear plastic base plates. All modifications that might alter the function or performance of the ignition control are prohibited.

2.26.2.3: The distributor must mount in the stock location and the engine firing order must remain unchanged. Distributor must have only a single inductive pick-up for use by the 

Positive

Negative

A

B

Ignition Power

Selector Switch

Coil A

Coil B

Distributor

CD Box A

CD Box B

Tachometer Signal

Tachometer

Signal

ignition system. Vehicles equipped with fuel injection may have up to two (2) additional pick-ups for use as sync signals for fuel injection control.

2.26.2.4: Crank-trigger ignition systems are not allowed.

2.26.2.5: Adjustable timing controls are not allowed.

2.26.2.6: Retard or ignition delay devices are not allowed.

2.26.2.7: The ignition system hardware and wiring must be mounted on the drivers right on the dashboard area. All wiring must comply with the accompanying picture. The ignition system must have a separate wiring system with visible wire tracing ability. (Not incorporated into the cars wiring harness.) 

2.26.2.8: The ignition amplifier must have a six (6) pin female connector attached to its output leads of the Packard Electric type (MSD p/n 8170) to allow for testing of the ignition during inspections.

2.26.2.9: All cars must provide the proper wiring harness to install the series specified revlimiter.

It is each Trans-Am Series Driver's responsibility to ensure that their car's engine is rev limited at or below the maximum allowed rpm. Maximum rpm for all 2-valve engines is 8200 rpm. Maximum rpm for all 4-valve engines is 9000 rpm. All cars must be brought to pre-event Technical Inspection with all ignitions operating at or below the maximum allowed rpm. No ignitions may be set to operate above the maximum allowed rpm for any reason. The rev limit will be verified by the use of an official SCCA Pro Racing tester. Any car ignition that does not comply with the maximum allowed rpm must be brought into compliance before the car will be allowed to practice, qualify or race. These tests may be performed at pre-event, post-qualifying, pre-race and post-race technical inspections as well as randomly throughout the event weekend. Entrants may request an engine rev limiter test at any time that the equipment is not being used for official impound testing. Any driver whose car is found to have an engine rev limiter operating above the maximum allowed rpm in post-qualifying or post-race inspections will be subject to penalties and fines. SCCA Pro Racing will supply competitors with Series specified rev-limiters at the beginning of each race event. All rev-limiters must be returned to SCCA Pro Racing immediately following the race. Failure to return rev-limiters before leaving the event will result in a fine of $250. If rev-limiters are not returned within five (5) business days, the team will be assessed a fine of up to the maximum allowed by the SCCA Pro Racing General Regulations and competition privileges may be suspended until the fine is paid. All cars shall provide the proper wiring harness to install a series specified ignition rev limiter (same wiring and connector as MSD Soft Touch rev-limiter). The required rev-limiter wiring is standard on all approved ignition boxes.

2.26.4.1: Any 12 or 16-volt battery permitted, provided it is securely mounted. The hot lead on the battery must be insulated.

2.26.4.2: The electrical system must provide a fully-operational starter motor, two (2) operating brake lights, two (2) taillights, and a master switch, installed per Appendix M. Taillights must be used at all times the car is running with rain tires, or as directed by the Chief Steward.

Chassis/Engine data gathering systems are allowed. If you choose not to use a data gathering system, you may deduct 25 lbs. from your minimum vehicle weight. The system data recorder must be mounted in an accessible location within the driver/passenger compartment. The data gathering system may only consist of the following sensor inputs: engine r.p.m., throttle position, brake pedal position, steering input, fore/aft and lateral g loads, free wheel speed (right front only,) and suspension travel. Engine r.p.m. may only be taken from an external sensor and may not be connected to the ignition system. The data gathering system must have a separate wiring system with visible wire tracing ability. (NOT integrated with the car's wiring harness or engine management wiring harness.) No display of information from the system is allowed. Down loading of gathered data on pit lane is prohibited. Chassis/Engine data gathering systems and all associated hardware may be claimed for $7,500.00 (seven thousand five hundred dollars), cash. The cash must be paid to the Technical Administrator before the claim action begins. The claimee will be paid after the system is removed. If a system is claimed, the car will be impounded after the session. The system will be sealed by the Technical Administrator and all items will be marked for later identification. At the end of the race both the claimer and the claimee will work together under the supervision of the Trans-Am Technical Administrator to remove the claimed system. The Technical Administrator or SCCA Pro Racing Technical Manager may, at anytime, review any data being gathered by any team during any Trans-Am Championship event. 

2.26.5.1: The only computers allowed in pit lane are those used by SCCA Pro Racing authorized Timing and Scoring crews.

2.26.5.2: Any violation of this section (DATA ACQUISITION) will result in disqualification and suspension from competition, loss of all points and monies earned at that event, and a fine of up to maximum amount allowed by SCCA Pro Racing General Regulations.

All cars will be required to mount the timing and scoring transponder at the rear of the car behind the fuel cell. A four inch wide by six inch long opening must be cut in the rear undertray to allow the timing and scoring transponder a clear view of the track surface.(See accompanying drawing)

All cars must be equipped with two-way radios to facilitate information exchange between driver and crew. At least one member of each crew must monitor the official SCCA Pro Racing Race Control radio frequency for information regarding restart lineup orders, track conditions, and information from the Chief Steward. It is the responsibility of each crew to relay all pertinent information to their driver in a timely manner.

ARTICLE 2.27: VEHICLE WEIGHT LIMITS AND ADJUSTMENTS

The minimum vehicle weight without driver and fuel is listed in the following table:

MAXIMUM INDUCTION MAXIMUM

ENGINE SYSTEM MINIMUM COMPRESSION

DISPLACEMENT TYPE WEIGHT RATIO
358 c.i. V-8* Carbureted 2700 lbs. 9.50:1
335 c.i. V-8* Carbureted 2750 lbs. 13.00:1
Ford 311 c.i. V-8 Carbureted 2700 lbs. 13.00:1
GM 311 c.i. V-8 Carbureted 2650 lbs. 13.00:1
Ford 311 c.i. V-8 Fuel Injected 2775 lbs. 13.00:1
GM 311 c.i. V-8 Fuel Injected 2725 lbs. 13.00:1
275 c.i. V-8, 4-valve Fuel Injected 2700 lbs. 13.00:1

*Only competitors allowed these engines are competitors on no appearance plan who have never won a Trans-Am race prior to the beginning of the current calendar year. Any non-regular or new driver to the Trans-Am Series must be approved prior to using these engine combinations.

2.27.2.1:If you choose to weigh car and driver together, add 150 lbs. to the listed minimum weight. Driver must always be available at weighings.

2.27.2.2: Competitors choosing to use 311 cu. in. Chevrolet V-8 engines utilizing cylinder heads with not less than a 17° valve angle may reduce their minimum weight by 50 lbs. Eligibility for weight reduction will be based on the valve angle of Approved cylinder head as manufactured. Heads eligible for weight reduction may not be angle milled or modified to produce valve angles less than 17°. 

2.27.2.3: Competitors choosing to use 311 cu. in. Ford V-8 engines with block deck height no less than 9.150 inch may reduce their minimum weight by 50 pounds.

2.27.3.1: All cars, when weighed without driver and fuel, may have up to 49% of the total weight on the rear tires.

2.27.3.2: Weight shifting or weight altering devices are prohibited. 

APPENDIX 2.A: ELIGIBLE AUTOMOBILES

2.A.2: 2000 ELIGIBLE MODELS
AUDI A6
BMW M3, M5
CADILLAC Catera
CHEVROLET Camaro, Corvette, Monte Carlo
CHRYSLER Sebring
DODGE Avenger
FORD Mustang
JAGUAR XK-8,XKR
LEXUS SC 400
MERCEDES BENZ CLK 430
MERCURY Cougar
OLDSMOBILE Aurora, Intrigue
PONTIAC Firebird / Trans-Am, Grand Prix
QVALE Mangusta
TOYOTA Solara

CHEVROLET Camaro, Corvette, Monte Carlo
DODGE Avenger
FORD Mustang
OLDSMOBILE Intrigue, Aurora
PONTIAC Firebird / Trans-Am, Grand Prix

2.A.4: 1998 ELIGIBLE MODELS
CHEVROLET Camaro, Corvette, Monte Carlo
DODGE Avenger
FORD Mustang
OLDSMOBILE Intrigue, Aurora
PONTIAC Firebird / Trans-Am, Grand Prix

2.A.5: 1997 and older ELIGIBLE MODELS
Subject to inspection and approval by technical inspectors and the board of directors.

1994-1998 Mustang (Roush, KFC, Derhaag)
1998+ Camaro (Derhaag, KFC, Victoria Motorsports)
1998+ Corvette (ACP)
1996-1999 Oldsmobile Aurora (Motorsports Composites)
1999+ Pontiac Grand Prix (Five Star/Leighton's Garage)
2000 Qvale Mangusta (Huffaker/Qvale)
2000 Jaguar XKR (Rocketsports)
2001 Chevrolet Corvette (Derhaag Mtotorsports)*
2001 Panoz Esperante (Elan Motorsports)*
2001 Dodge Viper (Motor City True Performance)*
2001 Ford Mustang (Derhaag Motorsports, EG Composites)*
* Body styles meeting 2001 design guidelines

APPENDIX 2.A-2: APPROVED AUTOMOBILES
(Dimensions and Specifications)

2.A-2.1: CHEVROLET

2.A-2.1.1: 1998 and newer Camaro

• Chevrolet V-8
• Minimum roof height, 46.50 inches. Minimum roof to decklid dimension, 11.75 inches.

2.A-2.1.2: 1998 and newer Corvette

• Chevrolet V-8
• Minimum roof height, 45.00 inches. Minimum roof to decklid, 10.50 inches.

2.A-2.2.1: 2001 Viper
• Chrysler V-8
• Minimum roof height, 46.0 inches. Minimum roof to decklid TBD. Minimum roof to wing TBD.

2.A-2.3: FORD

2.A-2.3.1: 1994 and newer Mustang
• Ford V-8
• Minimum roof height, 46.5 inches.

2.A-2.5: OLDSMOBILE

2.A-2.5.1: Aurora
• Chevrolet V-8
• Minimum roof height, 46.5 inches. Minimum roof to decklid, 17.50 inches.

2.A-2.6.1: 2001 Esperante
• Ford V-8
• Minimum roof height, 46.5 inches. Minimum roof to decklid TBD. Minimum roof to wing TBD.

2.A-2.7: PONTIAC

2.A-2.7.1: 1998 and newer Grand Prix
• Chevrolet V-8
• Minimum roof height 46.5 inches. Minimum roof to decklid, 13.50 inches.

2.A-2.8: QVALE

2.A-2.8.1: 2000 Mangusta
• Ford V-8
• Minimum roof height 46.5 inches. Minimum roof to decklid 13.00 inches.

All new parts offered for approval must be available January 1, to all competitors under the same terms and conditions before SCCA Pro Racing approval is granted.

2.B.1.1: CHEVROLET

2.B.1.1.1: Cylinder Block V-8
24502501GM Small Bore Bowtie
24502503GM Big Bore Bowtie

2.B.1.1.2: Cylinder Head V-8
14011049 GM Bow Tie Pro Action 14º
10051101 GM High port Bow Tie DART 15º and 18º
10134352 GM Low port 18° Brodix 15º and 18º
10134363 GM Raised port 18°
24502615 GM Raised port 15º
24502559 GM SB2
24502560 GM SB2 - CNC Ported
12480011 GM SB2.2
12480021 GM SB2.2 - CNC Ported

2.B.1.2: CHRYSLER

All Chrysler competitors must use a 9.025 inch deck height cast iron "R3" cylinder block from Mopar.

2.B.1.3: FORD

2.B.1.3.2: Cylinder Head V-8
M6049 C3L
M6049 C35
M6049 C3

2.B.2: BRAKE COMPONENTS:

2.B.2.1: BRAKE ROTORS

Any rotor of cast iron or cast steel material which meets dimensions as defined in Pro Racing Regulations. Cross-drilled rotors are not permitted.

2.B.2.2: BRAKE CALIPERS

All calipers must utilize no more than 2 pads (one on each side of rotor). Material must be monolithic aluminum. Metal matrix composite and aluminum beryllium calipers are prohibited.

The following calipers are specifically approved:
• Any four piston caliper
• Wilwood Grand National 6 piston caliper
• AP 6-piston caliper
• Alcon 6-piston caliper
• Brembo 6-piston caliper

Any non-adjustable, single adjustable or double adjustable shock absorber with a catalog list price of $500.00 or less or the following, specifically approved shock absorbers.

• CV Products Single Adjustable
• CV Products Double Adjustable
• Dynamic Double Adjustable
• Dynamic Triple Adjustable
• JRZ Double Adjustable
• JRZ Triple Adjustable
• Koni Double Adjustable 2812
• Moton Double Adjustable
• Moton Triple Adjustable
• Ohlins Double Adjustable
• Ohlins Triple Adjustable
• Penske Double Adjustable
• Penske Triple Adjustable
• ProTrac Double Adjustable
• ProTrac Triple Adjustable
• Quantum Double Adjustable

2.B.4.1: 5 Speed Transmissions:

• Weismann
• Hewland ST
• Hewland SST
• Jerico
• Saenz

2.B.4.2: 4 Speed Transmissions:

• Borg-Warner T-10
• Jerico
• Tex Racing T-101
• Rankin R-11
• Mid Valley Engineering NC 500

All refueling cans must be constructed of 0.064 inch aluminum and conform to the dimensions shown below.

The only approved dry break fittings for refueling in pit lane are "Red Head" male and female fittings. These fittings are produced by Induction Systems, and available through ATL (p/n RE104/RE105), BSR (p/n SCP-PP20FRM / SCP-PP20M), Fuel Safe (p/n DBF300 / DBF200), and other suppliers.

76 Competition 110 
Cam2 Standard Leaded, Supreme Leaded
Elf Pro 110
ERC A-19, A-19B, A-19DX
Koch Petroieum Power 110
Phillips 66 B-32, B-33
Sunoco Standard Leaded, Supreme Leaded
Trick Leaded, Turbo
VP C-11, C-12, C-14, C-15

All new parts offered for approval must be available January 1 to all competitors under the same terms and conditions before SCCA Pro Racing approval is granted. Dates given are ideal time frame dates. Requests may be received at other dates and will be handled on the time frames noted. The approval applicant is responsible for reimbursing SCCA Pro for all expenses incurred in the approval process. Failure of the part supplier to make approved parts (including bodywork) available to all competitors on a fair and equal basis may result in immediate revoking of the component approval.