
07-10-2011, 04:10 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Whatever the application dictates. I can do about 10.5-10.7:1 and run it on 93 octane. The P51 heads have awesome chambers; very efficient. You run about 28-30 degrees total timing. 
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