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Compresssion Ratio ?

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I'm looking at a car with the 67 OLDS high performance engine in it. 330CI and 320HP. I caught a line that this engine was designed to run on 100 octane and I'm concerned with using e93 highest available around here. The quoted CR is 10:25.
My rather aged experience thinks I can just dial back the timing a couple of degrees??? Advise appreciated.

Chuck

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