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Originally Posted by Ron H
Is it advised to have a 12.7 to 1 CR for 2235m or 7333' with 92 octane fuel?No
11 to 1 for aluminum and 10 to 1 for steel heads. You may get away with a bit more. 11.5, 10.5.
It is important to consider the camshaft being used as the dynamic CR can be higher or lower than static.
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This is your answer if running 92 octane