Brand new main bearing nicked. Usable?

nm9stheham said

The lower bearing is THE main load bearing shell at each main.

Scrape lightly as suggested. Then use it, IMHO. I personally would not further use Scotchbrite, nor worry too much over what you have done to this point. Inspect the bearing with a magnifying glass if you think anything embedded in it.

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I read an engineering paper recently that contends the upper bearing shell sees more load than the lower...

Don't take King off of your speed dial. Good stuff...they make bearings no one else offers and they may help you sometime in the future.

That nick in your bearing is inconsequential. Its like a fly speck on your windshield... fix it and you are golden. If you have a used shell pair them up and measure... you would be surprised how many race motors are assembled with mis matched bearings to get clearances correct.