I hope that when you performed the compression test that you had all of the spark plugs out of the head. Also you can perform a wet test, this is when you squirt a little oil in each cylinder when you go to test each cylinder. The cylinder that has 0lbs pressure should be heard from outside of cylinder a hissing or puffing noise. If you have to replace cylinder head gasket make sure that you also re-mill the heads for trueness of fitt when you replace the gasket other wise the same problem can happen again.
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