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Narrow flange bearing ate the wide flange crank! Now I've learned something new. Thanks!
I wonder what the chances of this happening with the correct thrust bearing installed?
The damage is on the rear thrust side. It was connected to an auto trans. The motor has 1,000 miles or less. I've never had it on the track, but I do like to accelerate at WOT when I have the space. The only questionable incident I can think of is when I hit a small patch of mud and lost traction.
The replacement crank is steel.



There is only a few things that can cause that...
lack of end play when it was assm, burr on the crank,
or and most likely your converter is ballooned...
if you measure the front and the rear sides of the
thrust bearing you will get a idea of how much wear
there is on the rear(within reason) but with all the
wear being on the rear something was pushing the crank
forward.. and that is usually the converter... when
you un-bolted the converter how much did it slide
rearward... I would still measure the converter to
see where the snout is in relation to the pump hub