2013 minor language changes are in bold; 2.4, 5.1, & 15.4

#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 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 eliminator / sliders is 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 any standard late model quick change rear end with steel tubes is allowed; V8 or midget quick changes not allowed
5.2 Ford 9” with steel housing and steel tubes is allowed
5.3 rear end gears must be locked
5.4 floater–type with wide five hubs encouraged
5.5 no torque sensing devices

#6 – Wheelbase
6.1 minimum of 104” with ½” tolerance
6.2 measured with “stick” from 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, driveshaft
9.1 OEM, direct OEM replacement, Bert, Brinn, or Falcon aluminum transmission is allowed [no magnesium]
9.2 automatic transmission does not need torque converter
9.3 automatic transmission must use an SFI approved explosion proof aluminum housing or be surrounded by SFI approved explosion shield / blanket
9.4 must be able to demonstrate forward, reverse, and neutral
9.5 driveshaft must be white; 2” Min Dia; steel, aluminum, or carbon fiber allowed
9.6 driveshaft must have sling / hoop
9.7 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 – Bell housings, starters. flywheels, clutches
10.1 cars must be self starting
10.2 any unaltered bell housing
10.3 starter may be engine mounted or reverse mounted on the bell housing
10.4 No accessories other than starter and alternator may be mounted to the bell housing
10.5 flywheel must be bolted directly to the crankshaft
10.6 scatter shield is mandatory for cars with manual clutch

#11 – Ignition
11.1 any HEI, point style, or unaltered MSD or unaltered PROCOMP distributor
11.2 only one MSD or PROCOMP box allowed
11.3 no magnetos
11.4 single 12 volt battery only

#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 closed

#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 only cast iron cylinder heads; casting and/or part numbers may not be removed
15.4 heads must retain OEM port centers and spark plug location; angle milling max 2 degrees
15.5 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
15.6 only N1 style Ford heads and only W2 or RT style Mopar heads are allowed
15.7 any solid or hydraulic camshaft; no roller or mushroom camshafts
15.8 any solid or hydraulic lifters; no roller or mushroom lifters
15.9 spark plug #1 must be within 1” of centerline of ball joints
15.10 no dry sump oiling system; no external oil pumps or Accu -sumps

#16 – Carburetor
16.1 one Holley 4412 style [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; no E85, no alcohol, no methanol
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