2024 USRA Stock Car Rules

USRA rules can be viewed and/or downloaded here.

VADO RULE EXCEPTIONS:

1. Aluminum Bodies are permitted, No flat side panels.
2. No Claiming
3. 360 c.i. engines must run 7400 RPM rev limiter.
4. Any engine larger than 360 c.i. or more than 10.5:1 compression must run a 4412 unaltered carburetor.
5. VORTEC heads are legal
6. 5.3 LS ENGINE RULES:
   1. The LS 5.3-liter engine is permitted with 525 camshaft, MSD 6014 ignition box, stock rockers and (un-ported) cathedral port heads only. Electric fuel pump is permitted with pressure switch and rollover switch.
   2. Up to 340 Cubic Inches: Must have stock (un-ported) cathedral heads and may use one (1) Holley 4150 series 4-barrel carburetor (see rule 7.3.3) and must have a maximum 7,000 RPM rev limiter (see rule 13.10.17)
   3. 341 Cubic Inches and up: Must have stock (un-ported) cathedral heads and must use a Holly 2-Barrel 4412 unaltered carburetor (see rule 7.3.4) ) and must have a maximum 7,000 RPM rev limiter (see rule 13.10.17)

These mufflers are mandatory. Valid part numbers: 112530, 112535, 113035 and 14272735-78.