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compression vs. octane?


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So yes I know it been covered and yes I've searched but I'm not seeing the info I need for my setup. Just did 20 cc domes and show 170 psi warm on both sides. +4 timing t5 pipes. Stock port stock bore and stroke.im also at about 400 above sea level. So question is do I need to run straight race fuel or would a 50/50 mix work?

 

Thanks for your help.

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