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Compression test on hot engine

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Old 03-11-2013, 01:29 PM
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Default Compression test on hot engine

Wouldn't a compression test on a hot engine show if a head or head gasket was cracked?

If you pulled all 6 plugs I would think having good compression across all cylinders would be a pretty certain sign of no head crack or faulty head gasket.

Would you have to open the coolant cap (carefully HOT) to remove pressure there as well to test properly?
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