could it be the wrong size bearings
unless you just rebuilt ( which you haven't told us ), no.
could the bearings be excessively worn? yes.
or low oil pressure?
low oil pressure is an intermediary step between the real problem and the damage that's causing the knock.
at this point i would say that you need to rebuild with heavy emphasis on cleaning up the oil system and checking pump clearances.
if you've just completed a rebuild, it may not be internal to the engine at all, but that's a completely different subject.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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