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many things cause low compression.. Head gasket, bent valves, burned valves, worn rings. etc.. i just did somewhat of a cylinder leakage test and i got air coming out of the crankcase which in fact is blow by, but im confused because i did a compression test before what happened and the motor was just fine. then the head lift up and the compression was leaking to different cylinders. but not its doing the same thing after i even fixed the head gasket and made sure head and block had a perfect seal.
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