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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.
2012 422 Allstars NSS Champion
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