Something In my #5 Cylinder?

stixx said
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.
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I'm sure something went through it.

But the idea you can hear .010 extra clearance isn't true. I've seen .040 not make noise. It sounded funny on the starter, but it ran and would close up the plug.

It also depends on the piston he has. Something is closing the gap WHEN THE RPM GOES UP.

That tells me it's gaining length somehow.