[Mike Taylor 3601]

radius next to counterweight is where strain is,groove like that most likely won't hurt it just have to be certain it isn't raised on sides,when it gets cut alot of times it raises metal on the sides that would mess up new bearing,if I was doing this I would show to my customer and get the OK from them,either they would leave it up to me or not want it like that, I won't use something like that for them to find later and not be happy about.
If you use it when putting back together after engine has been rotated check your bearing for scratching/scuffing if is OK I would check again before putting pan on,you can mic and feel of it but assembled and rotating engine will tell you for sure it is smooth enough.If regrind there is rods .040and .060 and mains .040, I would guess that .010 more on rods is probably still going to leave groove is only going to remove .005 off each side of journal
Mike Taylor 3601