I'd be interested in seeing how much, if any, the benefits of a 3-valve would be. Considering the awesome OEM flow of the rectangular ports of these heads, I wonder if the extra cost is justified. Heck - it is starting to look like these heads still flow better than the newest 4-valves from direct competitors.
I think what we're going to see soon are solenoids that directly control the valves (i.e. no camshaft, pushrods, valvesprings, etc.). I read about this several years ago and it looks like it makes sense; to a hotrodder, having about infinite control over the valvetrain would be an absolute dream!
I'm and the SIDI wagon, though, coming very soon. With the C6.R running their 5-Liter DI race engine, I think we're going to see that technology trickle down to OEM V8s - it's already here on several other engines
