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2025 USRA Stock Car Rules

by | Jan 15, 2025 | Rules

USRA rules can be viewed and/or downloaded here. VADO RULE EXCEPTIONS: Aluminum Bodies are permitted, No flat side panels. No Claiming 360 c.i. engines must run 7400 RPM rev limiter. Any engine larger than 360 c.i. or more than 10.5:1 compression must run a 4412...

2025 USRA Modified Rules

by | Jan 15, 2025 | Rules

USRA Modified rules can be viewed and/or downloaded here. These mufflers are mandatory. Valid part numbers: 112530, 112535, 113035 and 14272735-78.