Herberts used to be all made by them then Dougs Dad sold the tooling to Steen--they now continue to make them for several vendors like Howards etc they can be ID'd by the black coating they are USA made decent lifters that can be raced hard if you don't get too high on pressures I would say 550-650 open is max I would feel better with 550 range which is usually MORE than enough Howards would have some just like it if you need more