
08-02-2017, 12:04 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,592
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Not Ranked
FWIW, I'm running Ross Pistons at 10.2 CR with an alloy block and heads. But we have 91 octane gas here in CA. I wouldn't run 11:1 with iron heads, but I'm not an engine expert.
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