2010 WILLARD SPEEDWAY 4/6 CYL CLASS RULES

1) This division limited to 1980 to present front or rear (2) wheel drive American and Import automobiles with a factory (stock) wheelbase less than 105”. Vehicles must have a 4 OR 6 cylinder engine and standard or automatic transmission. Two door, four door and hatch back passenger cars/trucks are permitted.

.All Cars Must Remain Stock With Only The Following Modifications:

2) BODY - All doors, sunroofs and rear hatches must be welded shut. All glass must be removed. Glass sunroof openings must be covered with metal. No trimming of body panels. All mirrors (inside and out) must be removed. All exterior bright trim, moldings, lights and lenses must be removed. All body openings as a result of removed headlights, tail lights or rear trim panels must be covered with sheet aluminum or steel.

3) SUSPENSION - Suspension must remain unaltered. Springs and shocks may be replaced so long as replacements are direct OEM replacements. No 4 wheel steering.

4) INTERIOR – All seats other than drivers’ must be removed. Driver’s seat must be replaced with an aluminum-racing seat. Racing seat mounting brackets must be securely attached . All flammable trim material must be removed .

5) HOODS/DECK-LIDS – Hood and trunk-lid latches must be removed and stock hinges remain. Hoods and deck-lids are to be secured by a minimum of 2 hood pins.

6) WINDOWS - All exterior glass must be removed. Window and door-latch mechanisms must be removed.

7) ROLL CAGES - Four point roll cages, made of 1-3/4”O.D. x .095 tubing are required. Two uprights must be located in the furthest forward corners of the driver’s compartment and two uprights must be behind driver. All uprights should be located as far towards the outside of the car as practical. Top of cage should form a box and follow the contour of the windshield in front. The uprights must be welded to a 4” x 4”, 1/8” steel plate that is either welded. No galvanized or square tubing permitted. A horizontal bar connecting the two rear uprights, even with the top of the drivers’ seat back, is mandatory. Two cage support bars from the top hoop or rear up rights, running rearward to the rear seat floor area, at an approximately 45-degree angle are required. A dash bar connecting the two front uprights must go along the top of the stock dash board. There will be a minimum of 3 door bars on the drivers’ side and two on the passenger side. The drivers’ side door may be gutted for door bar installation. Gussets should be used where possible. Welds must be of good quality. The top of cage should be at least 4” higher than the driver when seated with their helmet on. All roll cage components, including door bars, cross bars and support bars must be the same 1 ¾” O.D. x.095” wall tubing. No bars may pass forward through the front firewall, but may rearward into trunk area. Cages must be approved.

8) PAINTING - Must be presentable AND VISIBLE! Numbers must be at least 18” tall on both doors. NO PRISM, METALLIC, DARK, SHADOWED or CLOSE COLORED.

9) RADIATORS – Must remain stock. Coolant must be water only.

10) FUEL CELL – Vehicles with stock in-tank fuel pumps must use stock fuel tank. Vehicles with external fuel pumps are permitted a maximum 8 gallon commercially made fuel cell. Cell must be mounted inside trunk area strapped to trunk floor, between frame rails. All fuel systems are subject to inspection and approval.

11) ENGINE – Engines are limited to stock, for the model vehicle, 4/6 cylinder engines with single overhead cam or push rod/rocker arm head configurations only. Maximum of 3 valves per cylinder is permitted. No DUAL or QUAD over head cams. No turbo or supercharger. No rotary engines.

No cylinder can exceed 175 lbs. Compression. Must pull 16 lbs of vacuum at 850 rpm.

12) CARBURETION / INJECTION – Induction system must remain stock manufacture unit. No aftermarket throttle bodies or mass air flow sensors. Stock air filter housing and connections must be used.

13) FUEL - Only straight gasoline or racing fuel is permitted. No nitro or alcohol.

14) EXHAUST SYSTEM - Exhaust manifold must be the factory produced unit for the model vehicle used. Exhaust pipes may be replaced, but must exit under car and behind the driver with turndowns.

15) MIRRORS/RADIOS - Mirrors and radios are not permitted in the car, or driver’s equipment. Cars will not be permitted on racing surface with mirrors or radios.

16) DRIVE TRAINS – Drive trains are limited to, two wheel drive only. Transmissions must be stock automatic or standard unit and must have all forward and reverse gears.

17) STARTERS/BATTERIES - All cars must have stock working starter. Stock column must remain intact. A quick release steering wheel and hub will be permitted on stock column. All batteries must be securely mounted & covered.

18) FUEL LINES - Fuel lines must be securely mounted and protected.

19) SAFETY EQUIPMENT - All drivers must be protected at all times with Nomex or equivalent fire suit, seat belts, shoulder harness, and helmet with a DOT STICKER. A 2000 or later Snell sticker HELMET IS PREFERRED. Seat belts and harness are required to be a five point system with lower crouch belt (six point systems are recommended). Mounting attachment bar for shoulder harness must be at shoulder height of the driver and harness should not bend or change direction as it goes through the racing seat if used. Belt systems must be a minimum of 3” SFI approved units, dated no earlier than 2003.Each car should have a fully charged and ADEQUATE B and C type fire extinguisher ONBOARD

20) WHEELS/BRAKES - Maximum 6” width stock TYPE steel wheels or STEEL RACING WHEELS are permitted. All four wheels must be the same size and offset. All wheel lugs must have at least 3 threads showing beyond lug nuts. Brakes must be in good working order on all four corners. Brakes are subject to inspection at all times.

21) TIRES – Only DOT 70 profile tires permitted. All tires subject to inspection/approval. NO SOAKING/DOPING/TREATMENTS.

22) INSPECTION - Inspection of all cars will be subject to official approval. Workmanship and appearance will be a determining factor in whether officials permit cars to enter competition. Upon cars first appearance of season, it may be permitted to compete ONE NIGHT provided minor constructional variances from the rules do not vary drastically. Officials ARE NOT obligated to any grace period on rule infractions at any time. Officials’ decisions are final.
23) WEIGHTS-4CYL CARS MUST WEIGH 2300 LBS MIN.
6CYL CARS MUST WEIGH 2500 LBS MIN.

NOTE: THE 4/6CYL CLASS AT WILLARD IS AN "ENTRY LEVEL" CLASS. ANY ENTRANT, CAR AND/OR MODIFICATIONS DEEMED OUTSIDE THE SPIRIT OF THIS CLASS/RULES IS SUBJECT TO ENFORCEMENT ACTION BY WILLARD SPEEDWAY OFFICIALS.