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I think it depends on what type of heads/valves ,Aluminum cast iron heads,,,
 

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I used to use AV gas with iron heads and something near 11:1, but with aluminum heads you'd be Ok with slightly more. Personally, I'd limit it to 12.5 with aluminum heads.
 

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mo balls than $cents$
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Sad to report cpjet Ricky passed away this morning in a car accident. Pray for his family
 

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RIP ,CPJET Live life to the fullest
 

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Dang it
 
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