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Your kidding , right? polishing the crank in the block? maybe thats why you have a problem with your engine now. How are you going to clean the grit out and other debree that the bearings pealed off? Do yourself a favor and pull the engine apart, clean and inspect it will be cheaper than just putting in another set of bearings and blowing it completely up.  
I was able to polish the crank with a long piece of 600 grit and crocus cloth, rotating the crank 90 degrees 4-times and pulled #2 & #3 rods to flush out the oil passages. I did that just to see if it would clean up. The motor was pristine when it went together. I am concerned that only #2 main went bad, so we will pull it and check the passages and cam bearings.
 that engine needs to be COMPLETELY torn down, inspected, cleaned, and repaired/ replaced as necessary. my guess is the oil pump failure was secondary to another problem. that engine needs to be inspected with the finest tooth comb.
for what is the good life if not doing things thoughtfully?
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