Something In my #5 Cylinder?

yellow rose said

It doesn't take long beating on a bearing like that before it develops some extra clearance.

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What is the average distance of a spark plug to the piston at TDC? For sure less than one of the valves when open. So no way in hell the rod bearing can devellop that much clearance as to let the piston hit the spark plug. A loose bearing can be heard when it's out by ... 0.01"? Sure the spark plug is farther away than that...

Otherwise... what oldmanmopar said: something broke off somewhere and went through cylinder #5.