Sure little tiny valves can work at high rpms cause they have very little mass to accelerate but then you need bunches of them. Worse of all they have a tree trunk called a stem, right there smack dab in the middle of the flow, blocking they way and causing turbulance. We need like a sliding door that slams open and closed. We also need to get away from mechanical actuation as that leads to power loss. I have reformed my goal George, I only need ten grand redline. That way we won't have to pop for taller gears to hit the magical 200 mph mark.