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At very least I'd be having the rocker cover off, checking with a flash ljght while poking about with a long thin screwdriver to visually confirm rods are fully seated in rockers. I believe best done from exhaust rocker box side.Perhaps issue was the rod was half seated, stuck on the cusp of the rocker seat. Giving some valve operation but not in proper sync with rest of valves. Thus poor cumbustion but still able to close, giving reasonable psi compression readings.
At very least I'd be having the rocker cover off, checking with a flash ljght while poking about with a long thin screwdriver to visually confirm rods are fully seated in rockers. I believe best done from exhaust rocker box side.
Perhaps issue was the rod was half seated, stuck on the cusp of the rocker seat. Giving some valve operation but not in proper sync with rest of valves. Thus poor cumbustion but still able to close, giving reasonable psi compression readings.
