Re: compression
About 6 to 1 unless you get a really high one that were made in the 60's. A racing engine may be 12 to 1 or higher, maybe 16 to 1. That requires a special fuel.
There is more to head design than the compression ratio. It requires clearance so that the valves can breathe and so that the cylinder is not choked off. The squish area is also important to provide turbulence for better combustion.
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Last edited by nkaminar; 04-15-2022 at 07:10 AM.
Reason: correct typo
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