The following specifications have been prepared by Hickory Speedway as guidelines for the construction of a 305-Sprint. No warranty of safety is expressed or implied as a result of this publication of rules. These rules are intended as a guide and are in no way a guarantee against injury or death to participants, spectators, or others. Anything not covered by these specifications should be approved by the track officials and placed in writing. Continuous developments in auto racing and technology may mandate changes in these specifications. However, it is our intent to enforce and police these rules throughout the season. If a change is necessary, technical bulletins will be prepared and distributed in advance.
This division is being developed for the fun of racing in a low cost fashion. This requires limits in various areas to keep competition equal and fair for all participants. In order to accomplish this, if it does not say you can -- don't! With the help and consideration of the participants, this can be accomplished. Try to live within the spirit of the rules. If you have questions, please contact track officials before you are found illegal for competition. Track officials have the final say in determining the eligibility of each participant.
- 1. All engines must be GM 305cid V8s. The block must be stock production type with maximum .060 over-bore for 3.796 in. maximum bore. Engine must have all casting numbers for identification purposes. The block must be completely stock-appearing on the outside. All engines must have flat-top pistons on stock appearing connecting rods. All crankshafts will be 305 cast iron shafts with 3.480 in. maximum stroke. Pistons cannot protrude out of the block.
- 2. Cylinder heads
- A. Steel: Must be stock GM 305 cast iron. NO new style center bolt valve covers. All legal GM heads will have "U" shaped markings on front or rear and inside valve cover for verification. The intake and exhaust ports may be matched for the first 1/4" only. NO other grinding or modifying is allowed. Valve springs must be straight and stock diameter (1.26 in.)
B. Aluminum: Must be Brodix 305 "Spec." head. NO grinding or modifying of heads allowed. Only modification allowed will be for temperature gauge installation. Valve springs and retainers must be kept to same specifications as shipped from Brodix. Any head repairing must be approved and teched before re-installed on block.
C. All: Maximum 1.940 intake and 1.600 exhaust valves. Minimum 56CC combustion chamber with valves installed. NO combustion chamber reworking. i.e.; Grinding, polishing, welding, etc. Stud girdles allowed. Maximum 3/8" screw in rocker studs and push rod guide plates allowed. NO roller rocker arms. Rocker arms must be stock steel type. Roller tips allowed. Must use min. .038 thick composite head gasket. NO steel shim gaskets allowed.
- 3. No grinding or defacing on the outside of the block is permitted. No solid lifters, no roller lifters, no roller hydraulic lifters, and no mushroom lifters will be allowed. After-market hydraulic camshafts and hydraulic lifters are permitted. Only hydraulic lifters are acceptable. All hydraulic lifters must be stock diameter. (0.842 in.)
- 4. Ignition coil on H.E.I. original equipment distributors must be stock OEM coil.
- 5. No amplifier boxes allowed.
- 6. Mags permitted.
- 7. Battery must be mounted in the engine compartment and fully enclosed in a spill proof plastic box. The battery box must be solidly fastened and be approved by the Tech Director. A gel-filled battery is recommended.
- 8. The oil system must be a wet sump system. No dry sump systems will be allowed. The oil pan must have an inspection hole of 1-1/8 in. minimum ID and 1/2 in. maximum extension. Location must be over connecting rod. Tech Director must be able to view the connecting rods.
- 9. Maximum fuel injection size permitted is 2-3/16 in. with all fuel lines in the manifold. Any larger injection must be tunneled to maximum 2-3/16 in. No down nozzles allowed. No carburetors or carburetor-style injections allowed. Stacks must be removable for tech inspection.
- 10. No titanium parts allowed anywhere.
- 11. To make it easier for the Tech Director to remove a lifter, there must be a 1-1/4 in. minimum ID hole in the front of the injection.
Note: Officials and the Tech Director will have the right to check engines at any time and will have the final say in determining the eligibility of any engine. If engine doesn't have injection or oil pan inspection plug, owner/driver will have to remove parts necessary to complete tech inspection.
- 12. Only straight alcohol (methanol) allowed. No gasoline, nitro, or nitrous systems. An approved fuel bladder is mandatory. Random fuel checks will take place. Fuel system infractions mandate immediate disqualification.
- 13. No electric fuel pumps.
- 14. All fuel system installations must be approved by the Tech Director.
- 15. Aluminum wheels allowed. Any steel wheel is permitted with the approval of the Tech Director.
- 16. All right-rear wheels must have a bead-lock system with a tubeless tire. These are subject to approval by the Tech Director.
- 17. NO tire pressure pop-offs or bleeders allowed.
- 18. Any tire combination will be allowed. All tires must be available to everyone.
- 19. All brakes must be in good working order at all times.
- 20. Failure upon inspection mandates disqualification.
- 21. No carbon fiber parts will be allowed.
- 22. A top wing is mandatory. The wing must be a minimum of 15 sq. ft. "All-Star" and World of Outlaws" rules for maximum size will apply. (25 sq. ft. maximum area)
- 23. 30 in. X 72 in. will be the maximum area allowed for side boards. Maximum wing width will be 61 in.
- 24. No wing adjustments from the cockpit will be allowed. No hydraulic cylinders or valves, no levers or cables for adjustments will be allowed.
- 25. Numbers must appear on both sides of the wing in sizes suitable for scoring purposes. Numbers must be 16 in. tall.
- 26. Front wing or nose wing will be allowed.
- 27. Frame and body must be sprint car appearing and must be inspected to be deemed safe for competition by the Tech Director. No frontal or air dam allowed.
- 28. Front and rear bumpers are required. Nerf bars, right and left, are required. Steel only.
- 29. No aluminum or titanium bolts allowed any where on the car. No carbon fiber or titanium parts will be allowed.
- 30. Workmanship, safety, and appearance shall determine whether or not a car will be allowed to compete.
- 31. Roll bar padding, a headrest, a rock screen, and a sub-strap are required safety equipment.
- 32. Aluminum spindles will be allowed.
- 33. A torque strap or safety hoop is required.
- 34. No torque arms or open drive lines will be allowed.
- 35. Any car may be inspected after an event at the Tech Director's discretion. If a car is found to be illegal during tech inspection after an event, the illegal car will lose its finish position, points, and money for that event. The remainder of the field will be advanced to cover that position.
- 36. Upon the occurrence of a second infraction, all points earned for the year up to that date will be forfeited as well as the points and money for that event. The owner/driver and car will be suspended for four dates of competition. This suspension can be carried over to the following season.
- 37. Engine protest - Winner will be required to remove one head for inspection only if protester is car owner and/or driver who:
- A. Finished in top 5 of winners feature.
- B. Competed in 80% of features held for the season.
- C. Presents Tech Director with protest fee of $200.00 cash within 10 minutes of feature end.
- If engine found illegal protest fee will be returned and winner disqualified. If engine is legal, winner will receive protest fee.
- 38. Track officials will have the final say in determining the validity of a protest or rules infraction. All decisions by track officials will be final.
- 39. Remove wing, hood and spark plugs.
- 40. Remove all valve cover fasteners. Remove all injector tubes and lifters. Remove all headers.
- 41. Open access hole to lifter valley. Note: All work must be done before entering the tech area.
