Quote:
Originally Posted by J Franklin
It sounds as if the ignition is too far advanced.
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I agree,
What you hear is detonation. DO NOT LET YOUR ENGINE DETONATE.
This can destroy an engine in a very short period of time.
A 5.5 Snyder head should not run more than about 26-28 deg. of advance at 2000 RPM.
If you have the ignition set for TDC when the spark lever is all the way up, then all the way down would be 40 deg. of advance. way too much for a high compression head. try running the spark about 2/3 down. that would be about 26 deg. of advance which is about right for a 5.5 head.
Run a little less spark advance around town when the engine is not running as fast.
My opinion,
Chris W.