Purchased used engine online failed leak down check valves are at .004 havent gone into it any more was checking for blown head gasket as they thought it had. Ignition side I'm at 48% @ 100psi exiting both exhaust and intake. On crank side I'm 6%@100psi head gasket leak. Should I do just valves and gasket if no scaring or should I go full rebuild it does spin free by hand no bad noise
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