…01/08/2010 revision… #1- Front stub 1.1 GM factory built 1970 ½ - 1981 “F car“[Camaro & Firebird] front stub must be used 1.2 stub must measure at 24” in front and 24” behind ball joint centerline and 28 ½” inside rails 1.3 GM factory “F car” cross member or exact replacement must be used; modifications for clearances only 1.4 steering box and idler arm must remain in stock location 1.5 front horns, ahead of steering box, may be rebuilt with tubing 1.6 engine location: #1 spark plug must be within 1” of ball joint centerline 1.7 front stub other than “1.1” must be approved prior to entry #2 – Front suspension 2.1 must use OEM or OEM direct replacement lower A-frames in stock location 2.2 must use 5 or 5 ½” diameter springs mounted in stock location 2.3 OEM, OEM direct replacement, or purpose built upper A-frames are allowed 2.4 must use OEM or OEM direct replacement idler arm and drag link 2.5 OEM, OEM direct replacement, or purpose built tubular tie rods are allowed 2.6 purpose built hubs and spindles are encouraged 2.7 jacking bolts are allowed #3- Frame between front stub and trailing arm mounting points [main frame] 3.1 must be constructed of 2”x2” square or 1 ¾” round tubing [minimums] 3.2 round tubing must be 4130 chrome moly or DOM with minimum wall thickness of .083” 3.3 each main frame rail must extend rearward to within a maximum of 21” to centerline of rear axle #4- Rear suspension 4.1 coil or leaf [single or multiple] springs allowed 4.2 three point only / no four point 4.3 may use panhard bar or W link 4.4 no bird cages 4.5 no brake floaters 4.6 only one shock per wheel 4.7 coil over shocks allowed on rear only 4.8 coil eliminators / sliders are allowed 4.9 no fifth coil over torque arms; no springs or shocks on torque arms 4.10 no spring or rubber mounted trailing arms 4.11 lower trailing arms must be solid mounted 4.12 90/10 shock may be mounted on top of rear end housing; it must be parallel to 3rd link or torque arm centered +/- 6” on housing 4.13 maximum of four coil springs per car #5 – Rear end 5.1 standard 10” diameter ring gear champ style late model quick change rear end with steel tubes is an option to the Ford 9” rear end; Ford 9” must be steel housing and tubes 5.2 8 3/8” diameter ring gear quick changes not allowed; these are sometimes referred to as V8 or midget rears 5.3 rear end gears must be locked 5.4 floater–type with wide five hubs encouraged and will become mandatory 5.5 no torque sensing devices Page 2 #6 – Wheelbase 6.1 minimum of 104” with ½” tolerance 6.2 measured with “stick” center of hub to center of hub #7 – Shocks 7.1 one mono tube or twin tube shock per wheel 7.2 Schrader valve shock option is allowed; no remote shock gas reservoirs 7.3 no compression or rebound adjustable [“clicker”] shocks of any type 7.4 no remote spring or shock adjustment devices allowed 7.5 coil over shocks allowed on rear only 7.6 coil eliminators / sliders are allowed #8 – Brakes 8.1 must be able to demonstrate operational 4-wheel braking system #9 – Transmission, bell housing, driveshaft 9.1 OEM, direct OEM replacement, Bert, Brinn, or Falcon aluminum [no magnesium] transmission 9.2 bell housing must accommodate 81/2” (minimum size) flywheel / starter plate 9.3 automatic transmission does not need torque converter 9.4 automatic transmission must use an SFI approved explosion proof aluminum housing or be surrounded by SFI approved explosion shield / blanket 9.5 must be able to demonstrate forward, reverse, and neutral 9.6 no accessories other than starter may be mounted to the bell housing 9.7 driveshaft must be a minimum of 2” diameter; must be steel; must be white 9.8 driveshaft must have sling / hoop 9.9 an L shaped 4” x 8” x 1/8th “ aluminum ‘leg saver” is mandatory; device must be mounted left of the driveshaft extending from the rear of transmission to the rear of the seat; 4” over the driveshaft and 8” beside the driveshaft; dimensions are approximate other than 1/8th “ minimum thickness #10 – Clutch and flywheel 10.1 minimum flywheel or starter plate diameter is 8 ½ inches 10.2 any single disk type or multiple disk clutch allowed 10.3 aluminum pressure plates, mini clutches, Coyote clutches not allowed 10.4 minimum clutch diameter is 5 inches [for cars using OEM / direct OEM replacement manual transmission] 10.5 scatter shield is mandatory for cars with manual clutch #11 – Ignition 11.1 all cars must be equipped with a functioning self starter 11.2 any HEI, point style, or unaltered MSD or unaltered PROCOMP distributor 11.3 only one MSD or PROCOMP box allowed 11.4 no magnetos 11.5 single 12 volt battery only Page 3 #12 – Body 12.1 purpose built dirt late model body which closely resembles WoO late model series car only 12.2 maximum height of doors, quarter panels, trunk lid and fenders is 40” from ground 12.3 maximum width 76” at firewall; maximum width 72” at rear deck 12.4 roof must be mounted level to the body 12.5 maximum roof size front-to-back is 54”; minimum roof size front-to-back is 44” 12.6 maximum roof size side-to-side is 52”; minimum roof size side-to-side is 48” 12.7 rear roof supports must be uniform in design and location; maximum 43” long at base; may not extend above the roof, must extend to within 1” to edge of body 12.8 rear roof supports may bow in or out a maximum of 2” as viewed from rear of car 12.9 rear spoiler may not exceed 6”x72”; must be mounted flush on rear deck 12.10 spoiler supports must be triangular shape; maximum of three; maximum dimensions 8” x 23” 12.11 wings, spoilers, deflectors, or any aero devices other than rear spoiler are not allowed 12.12 tires may not protrude more than 4” beyond the outer edge of the body #13 - Bumpers 13.1 front bumper and side skid rails must be mounted inside bumper cover and body 13.2 purpose built nose piece may not be modified; may not extend more than 52” from center of hub 13.3 rear bumper may not extend beyond 8” of frame on either side; ends of bumper tubing must be capped #14 – Weight [measured in track scale pounds] 14.1 track scales are official 14.2 minimum weight is 2700# after race with driver without adding anything; 2% tolerance 14.3 ballast must be attached with at least two bolts of minimum ½” diameter passing through ballast and a substantial member of the car; may not be welded into place 14.4 ballast must be painted white and must have car identified on it #15 – Engine 15.1 only cast iron V8 block 15.2 maximum displacement is 361 cubic inches for Ford or GM; 370 for Chrysler 15.3 no 400 CI blocks 15.4 only cast iron cylinder heads; casting and/or part numbers may not be removed 15.5 heads must retain OEM port centers and spark plug location; angle milling is allowed 15.6 only 23 degree heads for GM are allowed; no raised runner heads; specifically RHS part #s 12801, 12802, 12803, 12804, 12805, 12806 not allowed; others not allowed may be added 15.7 only N1 style Ford heads and only W2 or RT style Mopar heads are allowed 15.8 any solid or hydraulic camshaft; no roller or mushroom camshafts 15.9 any solid or hydraulic lifters; no roller or mushroom lifters 15.10 spark plug #1 must be within 1” of centerline of ball joints 15.11 no dry sump oiling system; no external oil pumps or Accu -sumps Note: heads may get further definition; principle is that what we have is legal and that new expensive options are not Page 4 #16 – Carburetor 16.1 one Holley 4412 [500cfm/two barrel] 16.2 maximum venturi bore is 1 3/8” 16.3 choke horn must be retained 16.4 maximum of two holes may be drilled in butterfly 16.5 choke plate, shaft, and linkage may be removed #17 – Fuel and Fuel Delivery 17.1 gasoline only 17.2 fuel cell is mandatory 17.3 fuel cell must be mounted in a minimum 20 gauge metal box securely mounted by two 2”X1/4” steel straps or 1” square tubing which completely surrounds the cell box; minimum dimensions 17.4 fuel cell must be mounted in trunk area and not lower than center of the rear axle housing 17.5 fuel lines should be routed outside of driver’s compartment; lines inside the driver’s compartment must be braided or enclosed in metal conduit #18 – Wheels and Tires 18.1 only 10”X15” steel wheels 18.2 only Hoosier RC-1, RC-3, RC-4 or American Racer EC-1, EC-2 #19 – Safety host track race car and driver equipment safety requirements will apply. Host track officials will inspect for compliance. #20 –other 20.1 we are guests of the host track; cooperate with track officials 20.2 RACEceiver or Solo II is mandatory; no two way radios 20.3 no mirrors 20.4 Series Marketing Partner decals will be provided and must be placed on car in conformance with location directions; failure to comply will result in no purse and no points 20.5 no electronic or computer controlled traction devices of any kind 20.6 no curtains or other concealing devices allowed on race cars while on race track property