I got them through my machine shop. C&S performance(Butler Wisconsin), but from what I remeber, they were 1.88'' BBC valves turned down to 1.81". I believe there was some stem work also, but I didn't do it myself, so take it for what its worth. I don't think I was ever told who made them, but I did get my old stuff back in a Manley box.

"use it 'till it breaks, replace as needed"