yes I replaced old valves. They had the pin type valve rotators.
one of the comments on the thread makes a comment about pin retainers- I m talking about the exhaust valves which do yes have a groove for the tapered retainers. The old valves had a small ole in the center of top of the stem to accept a rotator cap which was a small disc with a pin in the center to locate the cap on the top of the valve stem.
I reached out to this site where I bought the rebuild kit but no reply.