while stripping down my block so i can do some pressure tests, i found 2 rod bearings having a rather unusual failure. well one i'd never seen anyway. at first i thought they had fused onto the crank journal because they fought me hard when i tried to get them off. once off it became apparent they were no longer the same shape as the others. they where a tighter radius as well as being toast. they're the same part # as the others but they physically look like they were for a smaller journal. what would cause this?