Zipper,
I agree, I wouldn;t run them on something trying to make a ton of power, with big spring pressures either. I should have probably just kepy my mouth shut about them actualy, but, its to late for that now, lol. I also wish I wouldn;t have boughten these heads, as, I created a TON of extra work for myself, like usual.
As far as bogus flow numbers, I haven't flowed any of the cnc'd versions, but, I would bet, they aren;t even close to 308cfm, at 210cc. I am sure its a quick, basic port job, digitized, and recreated on the copy machine. THe set I did that went 280, was closer to that port volume, and they went 279.9 at .700, which, is rounded to 280. I will have some dyno numbers in a few weeks, hopefully, and I will give my Pro-Comp update. Actualy, mine are Strike Force heads, from EPW, same head, in a nicer box, lol. But man, did I mention the box? It was really nice. It was all foamed, and, the heads were further wrapped in bubble wrap. It was a nice box.
Frank
Advanced Performance
www.get-ap.com