Not Ranked
Well how much CR you can get away with is related directly to how much timing you want to run. When my motor was 12.5 to 1 and iron heads I used 92 octane and it was "OK" if I was careful (didn't lug it at low rpm, never ran it hot, careful taking off on hills, etc.). But when I ran 100 octane AND kicked up the timing I could drive it anyway I wanted and the increase in power was significant. Just something to consider...
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