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imo if it was an imblance issue it would affect no1 and no5 main bearings
as it would pivot ever so slightly round the center main & thrusts
it wouldn't affect one big end bearing only,that is another issue
possibly starved oil feed,con rod out of round (distorted cap?),
bearing layers lifted etc
three bearing mains 4 cyl engines suffer crank flex and take out the center main
the center main will fail first or the crank snaps in two before the BE bearings fail
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