Regarding roller lifters. This is not new technology either. I have a 1941 Ken-Royce (formerly LeBlond) seven cylinder radial aircraft engine in my hangar. It has roller solid lifters (tappets) and roller rocker arms. This engine was designed in 1938. Mine was manufactured in 1941. Joe Fulton Salinas, CA _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list