I went through 3 of there solid flat tappet cams in my 500" motor in a season. They were wiping out lobes and also had a lot of pitting in the cores. I switched to the same grind Comp cam and the lobe issue went away. I don't know if they weren't hardened correctly or if they had a bad batch of cores but I won't run them anymore. I will say that they did make a lot of power though. We made 773hp with a 500" Indy Ez headed motor on pump gas with a flat tappet cam.
