Yeah, I've seen those floating around somewhere, it would be an interesting looker. I spoke to Lorenzo @ Socal today and he told me quite a price on a set of those. I understand and have read the stockers are thin in some areas which always is a pain.
After having more time to read the rest of the posts recently. Magnus makes some great points, albeit, where are you speaking of turbulence Magnus? post valve seat? If you imagine the runner approaching the SSR, the moving down to the venturi area. How much time and area do you think you need to produce the proper flow past the intake valve? I think there may be a possible turbulence problem near the seat around the width of the SSR, if not, thats awsome since it should something different. Wet flow will tell. Like I said before a CFD on these heads would be very benefical!
If you don't have a certain time that the air flow can straighten enough to change directions without producing separation around the valve head we usually see a 'break in the flow-cone' as old Smokey would say and flow would be limited, plateau or go down possibly. Being that we can lose CFM just by a seat angle width change, I believe all portions are needed to be observed.
Has anyone thought about adding material anywhere? Granted these heads are not the largest ports in the first place.
I suppose this information should be stated, per square inch of area only 146cfm of flow @ 28" of water (maximum).