I have resurfaced lifters on the back side of my old Sioux valve machine. Nothing scientific about it. It is simply a V in the back of the machine. I think they are supposed to have .0015 to ..002. But I really don't have a way of measuring that. I just ut them on a piece of glass and used a .0008 feeler gauge. Either go or no go. Back when we had GMC tank wagons, we bought short blocks that came with cams but no lifters. I touched the old lifters up on the old Sioux machine, and we never had a cam to fail. 60 to 70 years oil wasn't very good. We usually threw a set of file to fit rings once and then bought another short block. I still have one of the old trucks that I installed a short block about 65 years ago
