Woah... definately incorrect here. A6 valves are different diameter than the z6/y8 valves.A6=Z6=Y8 valves. As far as flow goes, personal opinions start to swirl here...but I personally stick with the Z6, but that because I'm boosting.
i wonder about how true it is that the springs are different.. because honda doesnt say so.. honda lists the same spring for Si and DX (a6 and b2). anyone who knows for sure chime in. i currently have a b2 head im building for my a6 motor, and can easily get my a6 springs swapped over. but why bother if they are the same?:redface:Nope. They are PM3 castings. The cams and springs are different, and that's about it. (As long as you aren't talking about the 8-valve Hf engine.)
but +1 on the intake side seems to be the way to go.