I'd guess the lifter bores are not parallel to the cam, looks as if one side of the lifter is biased and it's not travelling flat on the cam, so you have an unequal impact loading where the lash gets taken up, that's displacing a small amount of cam metal. All that said, I'd put it on the crank polisher and I'd bet it looks like new, Lord only knows some of the stuff racers have crammed back into blocks "for one more run." S/F....Ken M