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It all depends on the configuration of the engine. If it's a mild, hydraulic cammed street engine, probably 3.73 or 4.11. A high-revving roller cammed engine would need more like 4.88 or 5.13.

Your goal would be to have the engine at it's horsepower peak or slightly higher when going through the traps.

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Q: What size gear do I need to race a 350 small block Chevy with 10 inch slicks?
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