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Possibilities are endless...LOL its possible that your intake gasket didnt seal quite right, ran it lean, and burned a valve.... also, did you properly torque the head gasket? Also did you check the head surface for flatness with a straight edge?
Just going over the things i would in my head (i am a small engine/compact diesel mechanic....)
Still cant rule out stuck rings either..... easiest way to check that is pour a tablespoon or so of ATF fluid into the cylinder, spin the engine over (by hand if at all possible) to work the atf around the rings, if they are stuck and not too badly, they should free up and give your compression back, at least more than 50 psi....LOL
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