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Cylinder compression is not really something that has a definite number. All 8 cylinders should be relatively close to the same pressure. If it is REALLY HIGH, like 140 or above, there is a lot of carbon buildup. If it is really low, like below about 70, you may have bad rings. Check the compression and if it is low, squirt a little motor oil in each spark plug hole and check it again. If it goes up considerably, you have bad rings. If it stays the same, or close to it, the rings are good.

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14y ago

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