Guide to Regrinding Camshafts

According to Ken at Oregon, it's a no go on flat tappet to roller. Only half the flat tappet lobe runs underneath a roller. Some companies are doing it, but failures are high. On regrinds of stock LA hydraulic rollers, some profiles allow up to .320 lobe lift and others allow up to near .340 lobe lift. Hydraulic flat tappets can be reground into solid flat tappets, but most solid rollers are going to require a billet core due to spring pressures required in solid roller profiles.