Test and Tune
Visit usraracing.com to get the current USRA 2026 Hobby Stock rules.
USRA released the 2026 Hobby Stock rules and incorporated most but not all of the USRA Hobby Stock 2025 Nationals Pure Stock Alternative Rules. This has caused concern for some. We applaud the efforts of USRA to bring everyone under one set of rules and because not all the rules were added, in 2026 IN ADDITION to following the 2026 USRA Hobby stock rules the following clarifications, as established at the 2025 USRA Nationals, will apply at I-35 Speedway:
If utilizing full spools in rear end, then 25 lbs. of lead must be added in front of the front shocks.
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.
If the driver’s 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.
Camaro’s will not be allowed.
Holes in the hood will not be allowed, must be covered.
Suspension chains or tethers will not be allowed.
Right Front bead locks will not be allowed.
Two inch offset wheels or spacers to create two inch offsets will not be allowed.
Exhaust EVAC systems will not be allowed.
The only tire allowed will be the American Racer KK704.
Quick Steers will be allowed.
Carbon Fiber Driveshafts will be allowed.
Must follow USRA Hobby Stock Weight Placement Rule (excluding any penalty weight)
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 @cam) hydraulic camshafts. Maximum 9.0:1 compression ratio.
1 5/8 non-stepped header.
