I've seen guys forget to polish the crank and just as important the oil holes will need to be de burred chews a lot of debris out in a hurry and bearings go bad form there.
then
I've seen guys nick the crank on the main studs as they drop it in?
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buddy did it once and the bearings started looked to like that after a short break in he found the debris in his oil filter check then pulled the pan had to pull his motor back out.
Around the same time A guy that works in my garage behind the house did the same thing!
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I found it after turning motor over a bit by hand and found my aluminum rods although clearing had next to 0 clearance when I pulled the rods low and behold the nicks where pulling debris off the bearings already and causing quite a mess and i had just been turning it by hand.
Anyways little file to take nicks off re polish crank new bearings and all was fine glad I found it before i ran it!
Next time I put plastic covers over main studs (crank girdle they are real long!)
![](/ubbthreads/images/graemlins/beer.gif)
Anyway I would have kicked his butt but hard to kick your own butt!
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I'll bet it was one of the above and or the block prep.
Check and re polish the crank clean the block new bearings and I'll bet your just fine!
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