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390 compression ratio...What?
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08-02-2005, 11:07 PM
xfordman
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Join Date: Sep 2004
Location: Grain Valley Mo.
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Biz...I'd like to know the answer to that also. I have the same truck 390, same year even. I hear they are very low compression but when I do a compression test I get 175 psi. I woulda guessed that to be at least 9 to 1.
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