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American V-8 Supercar Series Rules

1. General

2. Eligibility:

3. General engine Specifications

4. General Bodywork/Chassis

5. Wheels and Tires

6. Brakes

7. Suspension:

8. Exhaust system

9. Driveline

10. Steering

11. Fuel Tank

12. Safety

13. Appearance-

14. Driver conduct

15. Points


2008/9 American V-8 Supercar Series Rules (Revision 8 /Jan.10, 2008)


1. General class explanation and purpose:

  AV8SS is a dual class of racing comprised of multiple makes of cars beginning with model year 1964. All cars in the regular “sportsman” AV8 class will be equipped with front mounted V-8 engines and must be rear wheel drive. The Unlimited class will allow any engine configuration and all wheel drive.AV8SS is designed at the outset to be a showcase for aftermarket manufacturers and their products. All cars must retain the stock uni-body frame except as noted. Tube framed cars will be allowed on a case by case basis in the unlimited class only. These are to include but not be limited to the Panoz, all Factory Five vehicles and the Mongoose GTP. Again, the two classes are titled sportsman and unlimited.

  AV8SS is a sportsman pro series. To that end, sponsors will be actively pursued and purses will be paid whenever possible. A year end points purse will also be paid. The series' goal is to bridge the gap between grassroots road racing and true factory sponsored professional efforts. The series welcomes any and all manufacturers and aftermarket companies.

2. Eligibility:

A. AV8SS sportsman class will be represented by standard volume produced cars at minimum rate of 500 per year. All cars and components must be or must have been described in manufacturer's catalogs. All new cars must be available through normal dealer outlets at least 90 days prior to competing in an event. Any exception to these rules must be specifically granted by AV8SS.

B. Though known as an "American" V-8 series, Import and European cars that meet the rule requirements will be allowed and encouraged to compete.


D. Engine manufacturer and chassis manufacturer must be from the same manufacturer “Corporate” engines meet this requirement. So long as a model has been offered with a V-8, a car originally outfitted with a 4, 6, 10 or 12 cylinder engine may be fitted with a V-8. Exceptions to this rule may be granted if adequate precedent can be demonstrated.

3. General engine Specifications for the regular AV8 class:

A. AV8SS reserves the right to impose RPM restrictions to all engine combinations.

B. Factory engine management systems may not be replaced with non-OEM systems without specific approval from AV8SS in the Unlimited class.

C. Aftermarket aluminum blocks will be permitted.

D. The following is PARTIAL list of cylinder heads that must be individually approved by AV8SS but will automatically carry performance penalty of 100 lbs (except for the unlimited class): 18 degree GM heads, SB2 heads, Yates, Brodix B200 Series, Edelbrock/Glidden heads. All stock heads are legal as are most aftermarket heads. A complete list of legal heads will be published at a later date. In the interim contact AV8SS regarding head legality. Cylinder heads must retain the same number and location of intake and exhaust ports, valves, spark plugs, and camshafts as the production engine or as approved by AV8SS. Intake/exhaust porting and blending in the valve seat area is permitted.

E. All engines must be production based eight cylinder engines.

F. Please note that this section is a complete rewrite for the 2008 season and beyond. There will no longer be any inlet restrictions imposed in either class as a means of achieving parity and cost containment.

G. All major engine components/parts must be for sale and available to the general public in a regular product offering. Proof of this lies with the competitor.

H. Engine location:

1. Engine placement in the regular “sportsman” AV8 class must be located fore and aft such that no modifications except "dimpling" of the firewall for header and other ancillary component clearance is necessary. Forward firewall protrusions such as for OEM HVAC systems may be removed and replaced with flat sheet metal of similar gauge. The plane of the firewall may not be relocated. Minimum gap between the engine block/heads and the firewall is 1/2 inch. Again, firewalls may not be relocated. This restriction is no longer in place in the unlimited class. Engine placement is free!

2. Minimum crankshaft centerline height is 12 inches as measured from the ground with the car at race height.

I. The use of titanium or ceramic engine components is prohibited except for valves, retainers and wrist pins.

J. Production drive-by-wire systems will be legal. Others must be approved for specific models by AV8SS.

K. Intake manifolds for carbureted and fuel injected applications are free.

L. Variable valve timing is permitted if factory equipped or specifically approved by AV8SS.

M. Rocker arms must be constructed of steel or aluminum.

N. Engine electronics may be modified to a degree. Aftermarket ignition boxes, coils, etc., will be permitted. A means of controlling RPM limit is mandatory on all regular AV8 class vehicles. This is required in order to install the prescribed limit chip or setting. This does not apply to the unlimited class. Whenever possible, factory computers will be used on fuel injected applications. Aftermarket chips will be permitted. Stand alone computer control systems will be allowed in the sportsman AV8 class only if a case is made by the competitor why the factory system cannot be employed. UNDER NO CIRCUMSTANCES will the engine timing or electronic control parameters be accessible to the driver once seated and strapped into the race car so as to modify or change any settings to fuel delivery or spark control once the car has passed tech until it is released from post race impound. This burden of proof lies with the competitor. Anyone violating this rule will be banned from the series permanently.

O. Dry sump oiling systems will be allowed so long as the minimum crankshaft height rule is adhered to.

P. ENGINE EQUIVALENCY RULES: No longer applicable.

Q. The new rules for obtaining parity and cost reduction will be as follows: Two parameters will be monitored: Total vehicle weight with driver and RPM limit. Weight applies post race. The driver will declare these at the beginning of the year. The AV8SS director can at anytime lower the maximum RPM limit or raise the minimum weight for each individual vehicle. For this reason, competitors must be prepared to add up to an additional 100 lbs of ballast on any given weekend. Placement of this weight is up to the competitor so long as it is done in a safe manner. AV8SS will provide the appropriate rpm limit chips and/or mandate settings on such ignition boxes so equipped.

R. Self- policing: AV8SS will inspect the above items on a random basis or when it is thought that rules abuse has occurred. At any time prior to or no later than 30 minutes after a race is completed, each driver has the right to file a protest and request an inspection of a competitor's car that finished higher than the protestor. A cash fee will be paid to AV8SS to hold during the tear down process. Should the protest vehicle be deemed illegal, the cash payment will be returned to the protestor. Should the vehicle be found legal, 80% of the cash fee will be paid to the protested driver. The remaining 20% will be retained by AV8SS. The protest fee will be $500.00. Should an entrant be found illegal he will be subject to loss of finishing position, points for the event, monies awarded, and loss of season points, to be determined by AV8SS officials. All decisions at the track are final. There is no appeals process. ONLY DRIVERS MAY PROTEST.

4. General Bodywork/Chassis:

A. The external shape and recognizable features of the body must not change with the following exceptions:

B. Fender flares will be allowed so long as they are an integral part of the body. Said flares must cover the top half of the wheel and tire as viewed vertically from above. All flares must exhibit a tasteful and professional look. The maximum total car width is 78 inches.

C. Front air dams/splitters may be of an aftermarket design as approved by AV8SS. This rule is not intended to allow a competitor to change the entire front fascia of the car. The cars recognizable features must be retained. Front splitters/air dams must not extend more than a 2 inches forward of the original fascia when viewed from above. Minimum front ground clearance will be 2 inches measured at any point along the bottom of the front fascia, splitter or air dam. This measurement will be taken with the car in race trim.

D. Rear wings must be of a single or dual element design. Total wing height including end plates must not be above the roof, measured at their tallest points. The wing must not extend beyond the sides of the car when viewed from above and may not extend more than 2 inches aft of the original rear bumper mounting location when viewed from above. Wing material is free.

E Roof height will not be altered in any way from stock. No chopping and all factory windshield, side windows and rear window must be able to be installed with no modifications. All windows may be replaced with a Lexan type material with the only requirement being that the original size and shape window must be retained.

F. All body panel materials must remain as factory with the exception that the hood, front fenders, rear trunk/hatch and roof panel (not to include A, B and C pillars), which may be fiberglass and or carbon fiber on all makes and models. For the 2006 season and beyond, fiberglass or carbon fiber doors will be allowed. Any car equipped with fender flares may use fiberglass or carbon fiber in that modification.

G. Each car must have a minimum of  3.0 inches ground clearance as measured at all points along the rocker panel. No part of the car may touch the ground when both tires on one side are deflated.

H Strengthening of the unibody chassis and body work is allowed through the use of subframe connectors, integrations with the roll cage and seam welding. Any additional material to be added that is not an integral part of the roll cage must be approved by AV8SS.

J. The floorpan of the car from the firewall rearward must not be modified except for installation of safety components, rear suspension component clearance, fuel cell, cooler ducting and plumbing. The rear floorpan in the area of the "rear seats" may be modified on a case by case basis for exhaust clearance. This must be approved by AV8SS.

K. Front and rear frame rails may not be modified or altered in any way between axle centerlines for sportsman AV8 cars. The exception to this rule will be to allow minor clearancing of rear frame rails for suspension component travel not to include the rear axle assembly itself. This clearancing must be specified in the installation instructions of the part manufacturer.

L. Mini- tubbing or tubbing of any kind is prohibited in the sportsman AV8 class. Inner wheel well sheetmetal may be slightly modified to accommodate tire clearance.

M. All hoods must have a minimum of 3 mounting points. If the factory hood latch is removed, a minimum of two captive type hood pins will be substituted. The same is required of the rear hatch/ trunk lid.

N. Air extractors are allowed on the hood and fenders.

O. An aftermarket splitter extending and attaching to the K-member is allowed.

P. Underbody aero aids are permitted.

Q. No floating nose box permitted.

R. Brake cooling ducts are allowed.

S. Nose screening may be used to cover all openings.

T. Ducting behind the nose, in front of and below the wheel is free.

U. Cars must have at least two brake and taillights with a minimum of one working at all times.

V. Interior mounted rear view mirrors are mandatory. External rear view mirrors are recommended.

W. Air jacks will not be allowed for use during the race or at anytime while in pit lane or the hot pits. If installed, they may only be utilized in the paddock area.

X. Doors must remain unlocked at all times.

Y. If a car is equipped with a sunroof, it must be removed or replaced with a permanently affixed metal plate of the same shape and size. If the sunroof hole remains, drivers are required to utilize arm restraints.

Z. Convertible/ t-top cars will be allowed so long as they utilize a full cage and the driver uses arm restraints. All t-tops or actual convertible tops must be removed for competition.

AA. Maximum track width for all cars as measured from the furthest outside edge of the tire to the furthest outside edge is 75 inches for AV8 cars and 78 inches for Unlimited class vehicles.

BB. All holes in the firewall and floors must be sealed.

CC. Dash- Any cars not already modified (as of 4/1/2004) must retain the original dash cap. Instrument clusters can be upgraded within the dash and additional gauges are allowed. Dash pads must be identical to the production version in shape. Dashes may be gutted of all unnecessary wiring/ components so long as not visible or obvious from the outside when viewed from the front of the vehicle. All cars will be expected to adhere to this rule unless the driver/ owner provides documentation and pictures to show the modification prior to 4/1/2004. Should the factory dash have been removed, acceptable replacement must be utilized, for example, aluminum panel dashes. All dashes must be approved by AV8SS.

DD. Windshield- windows may be replaced by lexan at least 3/16" thick for the windshield and 1/8” in all other areas. All non-factory installed windshields must be securely fixed to the satisfaction of the AV8SS Chief Steward. They must also be braced internally with adequate braces running from the top of the roof (or roll cage) to the bottom of the windshield frame. This is not required for factory installations. Driver and passenger side windows must be removed unless all factory door panels and mechanisms are stock and unmolested. All quarter and rear windows may be replaced with lexan at least 1/8" thick. Non factory rear windows must also be braced.


FF. Minimum post race weight for the AV8 sportsman class with driver will be 3050 pounds and 2500 pounds in the Unlimited class with the following exceptions:

1. ABS equipped cars will carry a 75 lb handicap in both classes.

2. In no circumstance will the total post race weight be less than 2500 lbs. This weight may be modified as means of "competition equalization". Reward weight may be added at the discretion of the AV8SS Director and/or Director of Competition.

5. Wheels and Tires

A. Any wheel may be utilized in the regular AV8 class so long as it mounts to the factory or approved aftermarket hub/axle or spacer and is a maximum of 19 inches in diameter and 10 inches in width. Carbon fiber and wide 5 wheels are not allowed. Smaller sizes are allowed so long as the rear mounted tire/ wheel combination is not smaller than the front. For the unlimited class there is no restriction on the size wheel allowed but the other above restrictions remain in place.

B. Tires will be commercially available DOT legal road race tires of the competitor's choice. Maximum tire size is 295 section width front and rear for the AV8 sportsman class. Tire size for the unlimited class is unrestricted. Slicks will not be allowed. Rain tires will be allowed.

6. Brakes                                                                                                                

A. All OEM brake systems with the possible exceptions listed below are legal.              

B. Maximum rotor diameter is 15.0 inches front and rear.                                                

C. Water cooling of brakes is not allowed.                                                                                  

D. Carbon or ceramic rotors are allowed only in the unlimited class.                                                                     

E. Brake calipers are unrestricted.                                                                                      

F. Cockpit brake bias adjustment is allowed.                                                                    

G. ABS will be permitted but will incur a weight penalty of  75 pounds.

7. Suspension:

The intent of the suspension rules is to encourage aftermarket participation and support. In order to be classified as such, all parts must be readily available to the general public and, in most cases, present in a catalog. This does not however preclude some LIMITED leeway on the individual producing similar parts. What should be avoided are "one-off" suspension systems and components. As this is admittedly a gray area, any questions regarding suspension should be forwarded to the series rules committee, director of competition or the chief steward for clarification and WRITTEN approval.

A. Suspension mounting points may not be changed with the following exception:

1. Vehicles retaining a Macpherson strut front suspension must utilize the stock mounting strut points though caster/camber plates are unrestricted. In no case may the front shock towers be removed or altered on a car originally equipped with same.

2. Vehicles factory equipped with a front A-arm suspension may not change the location of the pivot points of either the upper or lower arms. For those vehicles originally equipped with struts and subsequently changed to an SLA, the SLA arrangement must fit within the confines of the original strut tower. Factory front upper and lower control arms may be replaced with aftermarket or fabricated replacements.

3. Rear shock absorber upper and lower mounting points are free and may lie in any plane from vertical.

4. On vehicles with rear lower control arms, modifications may be made to allow the fitment of different length arms. Forward attachment points will not intrude through the floorpan of the car.                                                                                               

B. Aftermarket front K-members are allowed so long as constructed of steel material. Accompanying aftermarket control arms and coil-over kits are approved.

C. Rear suspension may consist of Watts links, torque arms, Panhard bars, and various 3 and 4 link systems. Intrusion for 3 and 4 link systems into the cockpit is allowed so long as the moving parts are covered with sheetmetal and they present no safety hazard. Coilover systems are approved.

D. Cockpit adjustable sway bars, springs, and shock absorbers are NOT permitted.

E. Cross connected shock absorbers are not allowed and only one shock absorber is permitted per wheel. "Kicker" shocks as on late model Mustangs are not considered a shock absorber in the context.

F. Bushing material is free.

G. All suspension components must be of a homogenous metallic material with the exception of transverse leaf springs and rear leaf springs for various models that may be of an aftermarket composite material.

8. Exhaust system

A. Catalytic converters removal is strongly encouraged.

B. Mufflers are not required except at those tracks where a decibel limit exists.

C. Exhaust must exit behind the driver but beyond that the routing and type of

exhaust is free so long as it is executed in a safe and tasteful manner.

D. Variable exhaust systems are allowed.

9. Driveline

A. Beginning with the 2006 season, traction control systems will be legal.

B. Any commercially available manual transmission will be allowed. Aftermarket sequential shift transmissions will be allowed in the unlimited class.

C. Four wheel steering is allowed.

D. A driveshaft loop or retaining device of some sort must be employed in the event of driveshaft failure.

E. Automatic and semi-automatic transmissions will be allowed only on a case by case basis if the driver can show cause.

F. Rear axle assemblies are free. However, vehicles must race with the same type of rear axle as was produced from the factory, i.e. solid rear axle versus independent. Exceptions for retrofit will be made on a case by case basis.

10. Steering

A. Quick release steering wheels are allowed.

B. ALL air bags must be removed or disabled.

C. Steering wheel locks must be removed.

11. Fuel Tanks

A. All cars will be required to have fuel cells. The exception to this rule is a vehicle factory equipped with a mid-mounted fuel tank such as the Chevrolet Corvette. Maximum fuel cell capacity is 25 U.S. gallons. All fuel cells must be as produced by the manufacturer. Fuel cells must be separated from the driver by a metal bulkhead. Fuel cells must be of the bladder type encased in steel or aluminum. FIA certified bladders added to OEM tanks will be allowed.

12. Safety

A. All cars must have a full roll cage. Vehicles already containing stamped and certified roll cages from another sanctioning body will be assumed to be in compliance so long as no modifications have been made. The current recognized sanctioning bodies are SCCA, NASA, EMRA, Grand Am, FIA, Midwest Council. Cars from other sanctioning bodies may certainly qualify. This list is by no means complete but is representative. All cars must have a minimum 1.75 x .095 or 1.50 x .125 DOM steel tubing roll cage constructed to normal industry standards. The roll cage must incorporate a diagonal bar running inside the main hoop from a point nearest the bend behind the drivers head to a point where the main hoop meets the floor on the passenger side. An alternate method of compliance may be accepted. The roll cage may extend through the firewall to the strut towers or forward frame sections. Vehicles without strut towers may run a single bar from the cage, through the firewall to the front most portion of the frame rails. Holes must not be drilled anywhere in the roll cage with the exception of a single inspection hole. The number of roll cage contact points with the chassis and frame rails are unrestricted.

B. Convertible/Roadster drivers must utilize arm restraints such that the driver is unable to reach within 6 inches of the top of the roll cage.

C. All overflow lines/ports must utilize catch tanks. The only one of these that may in intrude into the driver compartment is the catch tank for the rear axle fluid.

D. Anti- freeze is not allowed at anytime.

E. Drivers are required to wear a 3 layer driving suit or a single layer with full Nomex underwear. Additionally, drivers must wear fire resistant gloves, socks and driving shoes.

F. Appropriate 5 or 6 point harnesses are required. FIA harnesses will have a 5 year expiration date, all others will be good for 3 years. Head and neck restraints are strongly encouraged.

G. A Snell 95 or better certified helmet is required. The helmet must be of an "SA" designation. "M" designated helmets will not be allowed.

H. Eye protection is required.

I. All vehicles will be required to have an on-board fire extinguishing system with a minimum of two nozzles. An additional hand held portable fire extinguisher (minimum 2.5 lbs) is strongly encouraged.

J. Any pressurized lines with fluids traversing the driver's compartment must be armored.

13. Appearance-

All cars will be maintained to the highest standards of appearance with full consideration of the fact that they are in fact race cars. Dented or unpainted cars will not be allowed on track without permission from either the Chief Steward or the Director of Racing.

14. Driver conduct-

 Any driver found to cause or instigate unnecessary contact on the race track between cars will be removed from the event. Rough and/or unsportsmanlike conduct on or off the track WILL NOT BE TOLERATED. In the formation of a professional series, all drivers are expected to conduct themselves as professionals.

15. Points/ Misc.

- Points will be awarded as follows: 1st place will be awarded 100 points.

Trailing positions will be awarded in descending order, 2nd-95, 3rd-91, then 88, 86, 84,82, 80, 78, 76, 74 and will decrease by 2 points through 20th place (56 points) and will then decrease at one point per position through the end of the field. A 10 point bonus will be applied to the year end total of all competitors having attempted to compete in all scheduled events for the year. Pole position will be awarded an additional 3 points per qualifying session. Non-finishers that complete at least 1/2 the winners race distance will be awarded points for their finishing order. Non-finishers not completing 1/2 the winners number of laps will be awarded 1/2 the last place finisher's points in their class.

During the course of the season drivers will be able to utilize a different car for a maximum of two weekends for the purpose of accruing points. A team or car may also substitute a driver for two events for the purpose of accruing points so long as that "team" has been declared to AV8SS officials by the 2nd race of the year. These allowances will not be combined. In other words, only two "variances" total will be allowed during the course of the season.

All weekends will carry the same available point total whether the weekend consists of single or dual races. AMB transponders are required on all cars. Transponders will be available for sale/rent.  All cars will be required to have AV8SS number plates on each of the two front doors. Drivers may select any single or two digit number and they will be assigned on a first come first served basis.

All cars will also be required to run AV8SS windshield banners.

              16. Licensing-

All competitors holding a current or past competition license from other race sanctioning bodies will be considered for an AV8SS license after review by the licensing committee. Minimum licensing age will be 16. AV8SS will hold licensing schools periodically for those who wish to obtain an AV8SS competition license.