Preston;
I am running an Edgerton regrind in my engine. Advertised specks 260 duration @ .410" lift. I did as Dennis mentioned and used a dial indicator to check the lift. The lift measured .396" (the advertised .410" minus the .014" valve lash adjustment) and I did not have any valve to head clearances. I am also using Chevy valves in my engine and they are slightly larger than the stock valves.
Don Coatney
