[63Banshee]

Probably going with Ferrea F5040 and F5048 valves (995 springs) on 716s and a single 177 head. I'll expect to cut the heads down. Thanks for the tip!

Originally Posted by b-man

The machine shop used 30677 Durabond Valve Seats for the exhaust on my '716' heads.

Exhaust valves - 6001SG S.I. Stainless - 1.660" x 4.970".

We used readily available 1.96" and 1.66" stainless valves with .100" longer stems, with the heads cut down to 1.93" and 1.645" respectively to eliminate any possible valve head to valve head interference. The original valve sizes were 1.923" and 1.663" according to factory specs. There's simply no room to enlarge the valve sizes, they're just too close together.