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Re: Engine noise
First, where is your ignition timing set? Depending on which cylinder head you have, it should be about 8 BTDC "initial", with a total of 38, "all in" by 2,800 RPM.
Do you KNOW which head casting you have? It could be very important. Also, any other modifications to the engine? Please be as specific as possible.
If your timing is "good", put a few gallons of 110 octane race gas in there and see if the noise deminishes or goes away. If it does, you're experiencing detonation due to too low an octane fuel for the compression ratio. The only "fix" for this is to reduce the static compression (pistons or heads) or run race gas as a "steady diet" (illegal in most areas).
All of this is VERY destructive of engine parts, particularly pistons and rings, so don't keep driving it except to "test" the changes.
Jim
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