We had a discussion a while back about these heads. At $1000 for the pair, they are a pretty decent alternative. I would say that they deserve a trip to a machinist for a valve job, to increase flow, and to check for whatever else. My set had 2 valve spring seats under one of the springs.

The numbers are as delivered on the top line, the bottom row represents a valve job to open up the seats and center the valves. I don’t remember any numbers on how wide the as delivered seats were or what they are now.

FWIW, here you go...