1. Any passenger type car, EXCEPT CHRYSLER IMPERIALS, NO pickups trucks, NO convertibles, or commercial type vehicles. Cars must have a front engine. All glass, exterior plastic, and chrome trim must be removed. No mirrors. If you are in doubt about your car, read number 1 again.
2. Stock gas tanks must be relocated to driver’s compartment behind driver in rear seat area. Metal fuel cells or any metal tank is allowed. Electrical fuel pumps will be allowed. A fuel pump cut off switch must be placed on top of the car behind the driver seat and be clearly marked with a 12”x12” contrasting color preferably red. No plastic tanks will be allowed.
3. Batteries may be moved to the inside of the car and secured at least 3 feet from the gas tank. You may have more than one battery. Batteries must be covered.
4. Suspension must be factory stock. If questioned you must prove it is stock. No modifications allowed to the springs, shackles or A frame. No load levelers. No solid suspension. No extra leafs or welded leaf springs. Coil springs may be welded to mounts but coils may not be welded together. You may change the rear suspension from coil to leaf, suspension must move and have 1 shackle per spring. All brackets can be no thicker than 1/4 inch.
5. Radiator mounts may be fabricated as long as it doesn’t reinforce the car over OEM design. NO RADIATIOR PROTECTION OF ANY KIND CAN BE ADDED!
6. Bumpers can be trimmed, provided there are no sharp edges, no other modifications allowed.
a. Bumpers can be welded to the stock mounts or brackets and brackets can be welded to frame. NO ADDED BUMPER BRACKET REINFORCEMENT ALLOWED! Shock absorber bumpers can be changed to solid mounts or welded (limit to 2-inch tubing MAX). If bumpers mounting brackets need to be fabricated, they are limited to 8X8 ¼ inch thick steel, 2 mounts at bumper and frame Max
b. OEM automotive or light truck bumpers only, no heavy- duty truck or pickup bumpers.
c. Fabricated bumpers are ok, limited to no larger than 4X4X1/4 inch (3/16 inch thick on new Derby cars), and no more than 22 inches from the ground to the bottom of the bumper. Open on both ends, straight side to side, not to extend past the center of the front tires, and not more than 10 inches past the outside of the frame. BOTH WILL BE ENFORCED.
d. NO POINTED BUMPERS
7. Fenders can be cut for extra tire clearance, not to exceed 7 inches above the tire.
8. No foam or solid-filled tires and no studded tires. All other tires are allowed, unless it deemed by officials to give an advantage. (don’t go crazy).
9. Car door must be chained or welded shut. If metal is used to weld door shut. No more than 12 plates (4” wide by 8” long, ¼ inch thick MAX), can be used per door. Doors can be welded shut completely with or without plates; gap filler is ok, if it doesn’t go past the door, fender or pillar seams by more than 2 inches. Driver’s door bars are ok but can’t go past the A pillar in the front and B pillar (center post) to the rear.
10. Hood and trunk must be secured. Complete hood must be opened or removed before the event for inspection, no exceptions! Hoods must be in OEM location and can NOT be moved forward or bent over in front of the Radiator (this is added RAD. Protection). No large chains or cables. Chains and cables must be easy to cut with bolt cutters. Cables and chains will be counted as a bolted hood mount. Hood must have a 6 inch or larger fire hole. The hood can be bolted shut, (maximum of SIX 5/8 dia. Bolts, small cables or small chain total), with no more than 6-inch-long brackets per mount, ¼ thick max per mount). Trunk can be welded, bolted, chained and/or cabled shut but you can NOT reinforce the trunk or rear fenders and trunk interior must be empty and visible. You may use filler for the gap only, if you use plates, they can be no larger than the door plates, with a max of 15 plates. Trunk cannot be welded to bumper. Trunk can only be bolted or welded to sheet metal, not to the frame, body mounts, cross members, or bumper.
11. Added reinforcement to the driver’s door is recommended. Driver’s door reinforcement can’t extend past the driver’s area. NO reinforcement anywhere else allowed, except as noted.
12. Driver’s door should be padded.
13. All drivers must wear a helmet, eye protection, long pants, long sleeves and closed toed shoes.
a. Driving suit is highly recommended.
14. Driver’s door must have a stop sign or STOP painted clearly on it.
15. Driver’s overhead protection bars are allowed (roll bar). Bar must be within 12 inches behind the driver’s seat and can be attached to the car’s door, pillar roof and floor. Bars cannot extend above the roof. No bars can be attached to the frame. Max of 3 bars (2-inch Max) from the driver’s protection bar can be added forward, but cannot extend forward of the cowl bar or attached to the frame. Any bars extended behind the driver’s protection bar can only go to the floor area, inside the driver’s compartment, max of 3 bars. (They can NOT extend past the back of the rear seat area). All bars max diameter is 2-inch (2-inch round of diameter or 2-inch square…. No 2X3” or larger bars). These bars are for the driver’s protection only, not to reinforce your car. If it looks like you have reinforced the car with them, you could be disqualified. Bars = tubing or pipes.
16. Cowl bars will be allowed, to take the place of the dash, no more than 2 inches in diameter.
17. No reinforcing of the frame is allowed.
18. Official primary inspection is for safety and conformation to rules only. It is up to the drivers to insure their car is legal. If the official finds an illegal car either during pre or post inspection it can be disqualified.
19. No drivers under 18.
20. Vertical windshield bars or screen allowed three bars 2-inch max.
21. No hand throttles! No string rope or uncovered throttle cable. Throttle cables must be OEM style (with outer housing), Morris control style or solid throttle linkage.
22. Old repaired Derby cars will need to pass tech inspection, on any out of spec repairs. If the tech inspector thinks your repairs give you an advantage you could be disqualified.
23. All holes on firewall must be covered with metal, holes for wiring; throttle and fuel must be kept to a minimum. Judges’ decisions are final. Firewall must run from fender to fender.
24. Driver is the sole spokesman for any and all matters pertaining to the event.
25. 2 car pass max. One pass for tow car.. One pass for support car.
26. All cars must a have a number plate affixed to the top of the car. With the car numbers readable on both sides in bold writing. Black on white or white on black. No other items may be fixed to the roof, hood, or trunk of the car. NO EXCEPTIONS!
27. Up to 8 chassis repair plates can be used on pre run derby cars, not new builds. Plates are limited to 8X8X1/4 inch MAX. These plates cannot be bent over the frame like angle iron.
28. Lower engine cradles are allowed but must not extend past the bottom of the cylinder head.
29. On board fire extinguishers are highly recommended and must be securely mounted.