like b.r.i.a.n. said, I think the different the versions corrected the centerlines of the of the vtec lobes. I don't think (feel free to prove me wrong) that they addressed the ramp angles of the cams (especially closing the valves). which in my opinion can be one of the factors contributing to "the timing chain slap" & harshness on the valvetrain & tensioners. If the cam shaft design does not support the closing of the valve - what does? the valvespring only? I think it was harley davidson once tested a camshaft with a square lobe. It made crazy power but not for long lol
as I stated in the other thread - I'd like to see these on a spintron at 9000-9500 & would also like to see before & after pictures of the valves & valve seats. if anyone has any please post them up