Ok, I jumped the gun on the ST valves. I found some more info on thm and I have absolutely no idea where I got the 40% flow increase.
Scotts (ssheen at MPGResearch) said they give about a 5% increase of flow.
New Valves - Surface Turbulence - Turbobricks Forums
However, I still believe that the increase in air/fuel mixing would be the biggest advantage.
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Originally Posted by scotts
With the valves they tune their engines for ~20% less fuel from normal for the given setup. If there was an issue with carbon effecting their efficiency, they would have to up the fuel as they became less efficient, which they have never had to do.
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