Tom, What are you using for seat and valve angle? I was going to recut the valve faces to 31 degrees to match my neway cutter, but opted to redress my grinding stone to just over 33 degrees the valve was. On all the Chief jobs I've done, there has been some room to position the contact area on the valve face on the intake side, but the exhaust always end up on the outside edge of the face. The exhaust opening doesn't have any material to work with inside. I suppose there isn't enough spring pressure to cause any trouble with a fresh valve, but it would be nice if the ex valves were 1/16 OS. Danny, I really like the slippery nitrided valves and they are only a little more money than the Chevy valves. I bought a couple of sticks of G2 cast iron rod with a big enough diameter to make Chief guides (what a waste of expensive material, just to accomodate the big shoulder) and have been tightening up the clearances to help with longevity.