What would cause this weird bearing wear?

moper said
I'm still at a loss for what was actually done when you put it together with those bearings. Or am I confused, and you didn;t put it together?

Anyway - it looks to me like too much oil clearance, probably a lot of tpaer on the journals, and oil wedge break down as a result. That lets the crank shift around in the block, and in some cases pushes it in one direction or another, creating the wear you see. I'd expect to see more copper is the crank was bent, and a lot more heat in the bearings.

In my opinion you should be using the right tools to measure the crank for taper, and crank and and the bearing bores to calculate clearance. Plastigage will not show taper. If you have oil clearance greater than .0025 I'd look at running a bearing to take up some of that. I generaly like to have between .002-.0025 on the mains.

I put the motor together, the crank I think was just polished a little bit, not much was done to it. Otherwise it was completely stock. Now the crank was turned under and polished and never installed, and it was checked so I should be nice and true.

Too much clearance? that could be it. So a bent crank would cause more damage? Now when I put it back together I should measure for the taper? so that may have been the issue before. That is done with a dial indicator right? I like jimmyrigged's suggestion, I may try that out.

Since the crank was pretty much untouched from stock is it normal for the journals to have some taper to them? or are they typically nice and straight from the factory