Found the problem

It was cylinder #1, apparently the bearing half made it’s way under the other side leading to a knocking noise as the crank smacked the connecting rod with essentially no bearing. I’m not sure how to prevent this next time, the bearing fit snug with a centering slot to the rods.

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This was using King trimetal bearings

This is the bearing after uncoupling the two halves that were smearing together.

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