So, I just bought a 543...

33IMP said

I just mentioned checking c.r. to make sure he wasnt running alcohol for a 14 1/2 to 1 motor, or something like that.

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Ah, okay. Nope, it isn’t anything super high. He thought it was 12:1 (which it may be, as I haven’t done any measuring of any sort yet) but he also thought he had 75cc heads on it. The 6091 casting number says they’re 84cc.