Ewok
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If you're concerned about it I would do another compression test. Remember you looking for the results to stay about 10% of each other, not 10 psi. If you find 1 cylinder with lower compression you could then do a leak down test to zero in on an exhaust or inlet valve, or a bad gasket leaking into the cooling system, or a bad piston ring. I've also read about 2 cylinders next to each other with low compression due to a gasket leak between the cylinders.