08/26/2026
Attn Pure Stocks in the Missouri Area. Here are the rules we will be going by at the USRA Nationals.
2026 Nationals Pure Stock Alternative Rules:
1. If utilizing a gauge legal 4412 Holley two barrel Carburetor, then the Wehrs restrictor plate part
number WM206100R1500 must be installed in place of the current required adapter plate.
2. If utilizing full spools in rear end, then 25 lbs of lead must be added in front of the front shocks.
3. If utilizing adjustable dual brake master cylinders, then it must be
adjusted to the center setting and
disabled from being adjustable from inside the race car.
4. If the driverβs seat is farther back than 70 inches from the back of the engine, then 25lbs of lead must
be added in front of the front shocks.
5. Camaroβs will not be allowed
6. Holes in the hood will not be allowed
7. Suspension chains or tethers will not be allowed
8. Right Front bead locks will not be allowed
9. Two inch off set wheels or spacers to create two inch offsets will
not be allowed
10. Exhaust EVAC systems will not be allowed
11. The only tire allowed will be the American Racer KK704
12. Quick Steers will be allowed
13. Carbon Fiber Driveshafts will be allowed
14. Must follow USRA Hobby Stock Weight Placement Rule (excluding any penalty weight)
15. If utilizing 1.5 ratio Roller Rockers , Non spec USRA Hobby Stock headers or midplate then the
following engine rules must be followed :
Maximum .456 lift (.300 ) hydraulic camshafts
Maximum 9.0:1 compression ratio
1 5/8 non stepped header
7000 RPM rev limiter with the MSD 8727ct rev box with unaltered wiring harness
602 crates, 6200 rpm limiter with MSD 8727 rev box with unaltered wiring harness
All other USRA rules apply!