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Old 09-03-2008, 07:30 PM
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Pull out the PCV and have a look. You may be feeding it 93 but of it needs 97..... You don;t always here the detonation, especially at high rpm. Smoke or steam out the exhaust could be head gasket trouble. Also a indication of detonation from excessive compression ratio/lack of fuel octane. There is not free lunch. Water injection does a good job of eliminating detonation on high compression motors that really need more octane that whats at the pump.
www.snowperformance.net

I'd do a compression test and a leak down test to see how the ring seal is.
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