Thanks, I generally adhere to the notion that if it worked before it ought to be possible to make it work again but it was quite vexing in this case. Possible and pragmatic are often in conflict. I actually am not convinced that my casting is significantly distorted or that the valves are bad, I think the main problem is the leather paddle seals. New paddle seals are available for Fords but are smaller. They aren’t complicated, but could spend more weeks fiddling trying to make them with the close tolerance and very fine edge fit and finish required. I also considered trying to come up with a differant seal design but I have many more fish to fry.