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I don't think that any leak down test can pinpoint air past the rings vs. air going through the guides. rings are by far more likely. Snap throttle test same thing, can't tell anything more than it is sucking oil in hi vacuum. I bet the external leakage is more prevalent on the road hot. Test: put a can under it and wire it in place. This would work if the leakage is at the cotter pin hole on flywheel housing. Not so for cam hole leaking directly out to the RH side exterior.