Cam regrinding question

I talked to Ken at Oregon Cam a couple years ago about regrinding the hyd roller out of my roller LA 360. I can't remember the exact verbiage he used, but essentially, he mentioned that he doesn't like to go too radical on regrinds because it grinds away the hardening on the cam core. He said it depends on the core itself. Apparently, some are better suited for regrinds than others - easily identifiable by numbers on the camshaft itself. If you call him, he'll give you all the information you need.