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scicala · 05-17-2021, 06:07 PM

By the way you described your problem in post #8, the noise you hear is not spark knock/detonation, unless you have your ignition timing set way too advanced. Ethanol in fuel would help reduce spark knock if anything. I guess it's possible if you have a later than '56 carburetor on your '55, it could be over advancing because of too much vacuum to the '55 distributor diaphragm.
I sounds like you may have some other issue like piston slap as mentioned in post #7, or some other noise.

Sal

05-17-2021, 06:07 PM	#11
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,706	Re: engine knocking 292 By the way you described your problem in post #8, the noise you hear is not spark knock/detonation, unless you have your ignition timing set way too advanced. Ethanol in fuel would help reduce spark knock if anything. I guess it's possible if you have a later than '56 carburetor on your '55, it could be over advancing because of too much vacuum to the '55 distributor diaphragm. I sounds like you may have some other issue like piston slap as mentioned in post #7, or some other noise. Sal Last edited by scicala; 05-17-2021 at 06:13 PM.