percentage also varies depending on the time of year and location. La-Z-Link As I said before, I'd be more comfortable with a good safety margin. A 168,000 mile NA short block wouldn't handle what boost I'd throw at it reliably given my situation. I've burned out a NA motor when I missed the proper tune and ran a static CR that was too high. Detonation can damage wrist pins. La-Z-Link
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