Update. Got hold of Bob today. Super nice fellow. Interestingly when we exchanged e-mail adresses I realized that we knew of each other. Small world.
Also got the valves, didn't get to do much, but we threw them in a stock head and ran it thru the flow bench.
At 10" H2O the flow at .050" increments is 13, 15, 30, 38, 52, 70, 88, 101, 106, 108, 108, 108 cfm.
A few obvious things. With stock ports they run into a wall at .500" lift, any cam over that is pi$$ing into the wind.
They flow about 10 cfm less then stock valves in a stock head.
But,
if you change lift at certain points the flow takes a big temporary jump and then stabilizes again. It can be nothing but the secondary valve seat positioning itself even though the flow is only in one direction, ie no reversion, no pressure in the ports at the base and a stationary valve. There might be something to it after all.
I'll post the flow #'s with the welded heads and stock valve sizes when we get around to it.