ManySHOs
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If you think you have a spun bearing, pull one plug wire at a time and see if it goes away when you run it. If it goes away, (if it is indeed spun), that is the one you spun.
While this makes sense in theory (maybe you've done it, I don't know), the rod is still being rotated through the engine and any play from a spun bearing is still going to be there. If it's bad enough, I would imagine that it would still make noise. It might not be as audible though.
Interesting idea though!
Ian