There are no membership fees or registration fees to run a Sport Mod at Jackson County Speedway.
1. We will follow the AMRA Modified rules with the following exceptions:
1a. Engine Blocks Chevy 350, Ford 302 or 351W, Mopar 340 or 360. OEM steel block only. (Max Cubic Inch 390.)
1b. 602 Crate Engines will be allowed with cast iron heads (no aluminum heads). The 602 crate engine must maintain original dual plane intake. Carburetor must match the rest of the rules.
2. Harmonic Balance
2a. Must be SFI approved.
3a. 175lbs. max compression (Hot) NO TOLERANCE.
3b. Must be dish or flat top pistons.
3c. No gas ported pistons.
3d. 602 Crate Engine must have 175 lbs. of compression or less per cylinder e. 3/8 “Diameter rocker studs maximum.
4a. stock (4412) 2 barrel Holley no modification except removal of choke plate. 4bbl carb is allowed with 602 crate/ no weight break. A straight open hole spacer allowed. (NO Super sucker type spacers allowed.) You may change jets, power valve and accelerator pump only. Must use stock metering blocks. There is a $360 (cash only) buy out on any carb or trade claimer for his. Driver must stop on front stretch to make claim then proceed to tech. Anyone refusing buy out will lose all money and points accumulated for that night. A Driver placing a claim must be on the lead lap. Carbs must be removed for final tech inspection.
4b. XP carb illegal.
5. Air Cleaner:
5a. Only one single round air cleaner. No air boxes.
6. Fuel Pumps:
6a. OEM style diaphragm pumps only.
6b. Must be mounted in Stock location.
6c. No electric or belt driven pumps
7a. Heads must be steel only with stock diameter valve spring. (Example: Chevy 1.260 not 1.625) No beehive or barrel springs, no stud girdles, must have OEM style stamped steel rockers, may use roller tip only. Roller rockers allowed, but no shaft rockers or pedestal mounts and must be 3⁄8 stud for rockers.
7b. OEM type if factory is 23 degrees valve angle your heads must be likewise.
7c. No porting of any kind. (This to include gasket matching & bowl blending.)
7d. No Canted Valve Heads (Cleveland Type)
7e. No spacers between heads & intake.
8a. Hydraulic or flat tappet (solid) no roller of any type, must fire OEM (example: Chevy 18436572) no 4-7swap cams.
9. Intake Manifold, Adapters and Spacers:
9a. Any 4 BBL open plenum.
9b. Max 1 1⁄4” tall; no porting or machine matching of any kind. (This dimension Includes gaskets.)
9c. No Velocity tubes on adaptors or built into the intake of any kind.
9d. NO PORTING of any kind (this includes gasket matching or anything to increase air flow) to be as taken out of the box.
10a. No trigger type and /or crank trigger type: MSD or HEI (OEM) is permitted.
11. Oil Pump:
11a. Must be wet sump only (in the pan) no external oil pump of any kind.
12. Oil Pan:
12a. Must be steel only no exceptions.
13. Evacuation Pump or System:
13a. No evacuation pump of any kind on the engine.
14a. Only one American passenger car battery with a maximum of 12 volt. (No 16 volt battery)
14b. Battery MUST turn car over to check compression during inspection. If not then car is disqualified.
15a. Bert, Brinn, Falcon etc.
15b. Must have forward and reverse working.
15c. Must have an explosion proof bell housing. Bert style transmission can have stock aluminum bell housing.
16. Rear End:
16a. Quick change or any American OEM.
16b. NO cover on pull barspring.
17a. Steel CRIMPED / SPUN tube top and bottom, non-adjustable, non-rebuildable. With a $80.00 Buyout. Must have a fixed bearing and can have a removable heim joint. (No Schrader valves or remote reservoir shocks of any kind.) No gas shocks of any kind. Oil filled only. NO bump Stops. Some of AMRA Shocks approved: * If you do have other shocks they must be approved by an AMRA Tech. AFCO - 1400 series, 1200 series INTEGRA - 4200 series P/N 310-421XX PRO SHOCKS - WB Series P/N WBXX **NO ALTERING OF SHOCKS
18a. 2500lb. (Any inspected, verified, and factory sealed GMPP crate 602 2350lbs.) *Track scales are the official scales.
19a. Must comply with AMRA Modified Rules.
19b. Any 3 Link or OEM 4 Link get 100lb weight break.
20a. Must comply with AMRA Modified Rules .
21a. RR 60 mandatory. M30 or M60 other 3 corners.
21b. Must run same rear tires all night. They will be checked and marked during inspection. If you have a flat the track tech must approve replacement tire. Tire must be same make and compound of old tire. It will also be marked. 21c. Hoosier only M30 or M60. No exceptions! Siping allowed. No grooving.
22. Cooling System:
22a. Cooling System may be modified. Radiator and oil cooler must not protrude above interior. No Electric water pumps or cooling fans. No sprinkler systems. Any overflow tubes are to be directed to the ground, between frame rails.
23a. All vehicles must have the capability of starting without being pushed or pulled. Starter must bolt to engine in factory location and working. This means the stock starter must start the car and be the only one on the car.
24a. May use aftermarket headers. Exhaust system must be mounted in such a way as to direct spent gases away from cockpit of vehicle and away from areas of possible fuel spillage. Exhaust header outlets no higher than midline of the body sides. Officials may require turn downs on the collectors. Dual exhaust only no ”Y” pipes or 180 headers. No oxygen sensors allowed. Tri “Y” headers are not acceptable.
25a. Gasoline ONLY (No Alcohol) Race Fuel is allowed.