roller cam prep
Trashed cam (your pick), find another. If you think it's usable, media blast the lobes and have it cryo'd before install.
Tape the bearing surfaces, use (fresh) medium grit titanium oxide, 60/70 psi, about 10"/12" from the lobe surface and don't stay in one place (keep the gun moving) and rotate the cam to insure you get a nice even finish. This all works to get the rollers to bite instead of sliding.
Do not leave the ti oxide in the media blaster, remove it for another day.
The Cryo treatment greatly reduces lobe wear (peace of mind too). good luck...