check them out like he said if ther car has alot of miels and they look worn or you have a tick then id replace them but roller lifters are usually good for a long time i changed cams in my old motor at 90k and kept stock liferts and never had a prob
I'm don't think roller lifters really break in with a certain cam, swapping wouldn't be a problem, but like the guy said, if you got 'em out, spend a few and get new ones, crane has some nice ones, comp sucks for hyd. rollers, my stock ones had closer tolerances.