The "Open Class" derby is open to any American made passenger car. All full framed Chrysler Imperials are not permitted. No trucks, vans, Suburban's, or commercial vehicles. Limo's are permitted.
Section 1 Car
(b) Flammable materials inside the car must be removed. These include the carpet, the rear seat, and interior trim including side and roof liners. Trunks must be free from any debris. The inside of the doors must be clear of all glass and debris as well.
(c) All light covers/bulbs, side mirrors, hubcaps, grills, side chrome, plastic, door handles and pot metal must be removed.
(d) All trailer hitches, related brackets, reinforcements and hardware will be completely removed.
(e) Stock fuel tanks must be removed.
Section 2 Fuel Systems
(b) Gas lines and fittings must be leak proof. No exceptions. Rubber fuel lines located inside the passenger compartment must run through a second larger hose such as a garden hose to prevent accidental spillage on the driver in case of a leak. A hole must be made in the floor board for fuel runoff.
(c) Electric fuel pumps are optional. If an electric fuel pump is used, you must have an on/off switch that is positioned so that up is on and off is down. The switch must be easily visible and "off" must be clearly marked.
(d) Gas tanks may not be bolted to the frame in any fashion. Gas tanks MAY not be used as a kicker to keep the frame from dropping or moving forward or backward. Subject to Tech Approval.
Section 3 Batteries
(B) Two (2) batteries maximum
(c) Switches or wires used
for powering off the car must be within reach of the driver while
harnessed in. There will be no acceptable excuse for not being able to
turn off your car in an emergency situation.
Section 4 Safety Bracing
(b ) A rear cross brace must be installed from side to side behind the driver as close to the door post (B pillar) as possible, and at least halfway up from the floor. It must be made of a minimum 3" pipe or square tubing, with plates welded on the ends. The end plates may not extend more than 15" past cross bar (towards rear of car). The cross brace must be bolted with minimum of two (2) ¾" bolts per side, extending through the side irons. If the cross brace is collapsible, it must be pinned with a ¾" bolt (minimum) or welded so it can’t rotate. Optional: If floor boards are rusty, you may run MAX 2" Pipe or square tubing over to the inner rocker panel sheet metal. It must be welded, no bolting of this bar! This bar MAY NOT be welded to the frame!!
(c) All cars must have a minimum of 1 upright (vertical) post. Upright must be located directly behind the driver's seat. The upright must be made of a minimum 2" pipe or square tubing with a minimum 4" x 4" plate welded to the top. The upright will extend from the roof to the cross bar, or to the floor and be located as close to the seat as possible. It must be attached with minimum of two 3/8" bolts on each end. Note: If using a two-piece upright, the female end should be above the helmet level, unless the upright is welded or solidly pinned with a ¾" minimum bolt. Optional: May add 2nd upright on passenger side of vehicle. Uprights may in no way be connected to the frame.
(d) Both front doors must be reinforced with a minimum 8" wide, 3/16" thick channel iron. The side iron must not be more than 6’ in length and must begin ahead of the front door seam and be no more than 6" in front of the front door seam. The iron must be bolted with a minimum of three (3) bolts (3/4" min) that extend through the inner panels. Backing plates (washers) must be used and must be a minimum of 6" x 6" x 3/16" thick on both front and rear ends of the door bars. The front bolt must be located no further back than the front fender/front door seam and at least one other bolt must go through the plate connected to the rear cross bar. The ends of the side irons must be cut at a 45-degree angle.
Section 5 Seat and Seat
(b) Seat can be OEM stock of any make/model car. A headrest on the upright behind the drivers is mandatory if the seat was not equipped with a headrest.
(c) No fiberglass/plastic
racing style seats
Section 6 Building,
Welding & Securing
(a) Doors: You may fully weld the doors. You may use filler no larger than 2"w X 1/8"t or 3/8" re-bar or equivalent. If bolting the doors shut, you may use up to 4 1/2" bolts per door. If chaining the doors shut, you may use 2 chains, no larger than 3/8" per door.
(b) Trunk lids, tailgates and hoods must be secured shut with bolts, chains or welds as follows:
(i) Hoods can be bolted in a maximum of 6 places other than stock, in which only 2 may go to the frame. Bolt size must be a minimum of 5/8" and a maximum of 1". MAX plate size is 6" x 6". Bolts must not exceed 4" above the vehicle surface. HOODS MUST BE OPENING FOR TECH!! NO EXCEPTIONS!
(ii) Chains must be a minimum 3/8" & maximum of 1/2" welded type. A bolt no smaller than 3/8" & maximum of 1/2", with washers, must connect the chains.
(iii) Trunks may be fastened in a maximum of 6 places using chains, bolts or welds of which only 2 may go to the frame. Welds cannot be more than 6" long or if using flat plates, they must not exceed 6" x 2"x 1/8" in each place. If bolting, plate size cannot exceed 6''x6''. All thread (1" max) may go through frame or be welded to the side of the frame. Cars must have an inspection hole in the trunk.
(c) Bumper swaps are allowed, however you must use factory hardware (brackets/shocks) that either came with the bumper or came with the car you are putting it on. You MAY NOT use both!! Any questions....call tech.
(d) Front and rear bumpers may be welded solid. (I.e.-bumper to bumper shock, shock to bracket and bracket to frame) No extra metal. (e) Bumper shock itself may be collapsed and welded. No added material.
(e) Bumper shock itself may be collapsed and welded. No added material.
(f) You may weld outer skin to inner structure of bumper.
(g) Frame seams may be welded from the firewall forward. You may only weld the top seam. Width of the weld will not exceed 1/2''.
Section 7 Window /
(b) A maximum of 2 3/16" thick x 2-1/2" wide flat stock must be installed down the center of the windshield from top to bottom. Window bars may be bolted or welded with a minimum of 5/16" and maximum of 1/2" bolts. No sheet metal screws allowed fastening window bars.
c) Optional rear window bars may be added no more than 6" extension on roof and in no way contact the deck lid, trunk pins, trunk plates or frame. They may be no bigger than 2-1/2"x 1/2" inch thick flat stock. Max 2 each parallel with roof. Window bar(s) will be bolted or welded with a minimum 5/16'' and a maximum of 1/2" bolts. No sheet metal screws may be used to fasten window bars.
Section 8 Radiator
(b) Transmission coolers other than stock, if used must be in an enclosed box inside the vehicle. Transmission coolers and all hoses must be leak proof. No screw type clamps on any transmission hose connections inside the car.
(c) Transmission coolers and components may NOT be bolted to the frame in any fashion. Transmission coolers are NOT to be used as a kicker to keep the frame from dropping or moving forward or backward!! Subject to Tech Approval.
Section 9 Motor Mounts /
(b) Any 5 lug rear end may be used.
(c) Upper/Lower control arms maybe shortened or lengthened to achieve pinion angle. You may NOT reinforce the rear end control arms (trailing arms).
(d) Leaf conversions are NOT allowed on non factory leafed cars. Suspension must remain stock.
(e) Maximum of 9 leafs.
Section 10 Distributor
(b) If using an engine
cradle, it must not be connected to the distributor plate.
Section 11 Exhaust
Section 12 Carburetors
Section 13 Brakes
(b) Wheel wells may be trimmed. No shackles or reverse spring shackles will be allowed.
(c) Valve stem protection is permitted.
(d) Tie rods may be reinforced. Must have stock tie rod ends. No pipe ties rods.
Section 15 Sign Boards/
Section 16 Repairing
Section 17 Options.
(b) You may clamp leaf springs, 4 clamps per leaf. 2"x1/4" MAX, two 3/8" bolts per clamp.
(c) Body mounts may be removed. If replacing bolts, you may use bolts/all thread no larger than 3/4", MAX 3"x3"x1/4" washer/plate. Washer may not cover body mount hole on exterior of frame. Must be able to see in the frame. NO EXCEPTIONS!!! In addition you may add two (2) body mounts. No larger than 3/4" bolts/fasteners. MAX washer size is 3"x3"x1/4". Must be brightly painted for easy viewing.
(d) You may re-bolt hood skins. 15 bolts maximum. 3/8''max bolt size. 1" max washer size.
(e) You may re-bolt wheel wells. You are allowed 5 3/8" bolts with 1" diameter washers per wheel well.
(f) Fire extinguishers are NOT mandatory, although highly recommended. If a fire extinguisher is installed in the vehicle, it must be securely mounted and within drivers reach.
(g) You may chain the humps. You will be allowed 1 wrap of chain. It may go around the rear end 1 time and up through the body and around the frame 1 time and be bolted together.
(h) All cars should be brightly painted. - This is for the promotion of the sport.
rules are designed to offer a fair and unbiased opportunity for all
drivers to compete on an equal level.