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The leak down is not affected by valve cover gaskets or valve adjustment. It can be affected by bits of carbon in the combustion chamber. A second leak down test -- even if only on #1 is a good idea, after the car has been driven a bit.
I should add: if the discrepancy in compression is really 25 lb. after a second test, you are looking at a top end overhaul in the relatively near future. Something to factor in.
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Last edited by techweenie; 07-17-2014 at 12:21 PM..
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