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#13: 03-08-2013, 12:14 PM
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I believe the guideline is that compression numbers for a given cylinder should be no more than 10% off the other three. Depending on how the compression test is done, you may have numbers in the 120-130 range. When I blew a ringland, my numbers were 120-130 psi on cyls 1, 3, and 4, and 63 psi on cyl 2.
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mcdougaldm (03-08-2013)