NoFear,
I don't have any personal experience with the Pro Comp heads but I trust what some machinists (which I have dealt with such as Mike Lewis) have stated.
Don't want you to throw your money out the window either!
If you have time and/or a buddy that can help translate, here is some information for you to make your own decision:
http://www.chevelles.com/forums/show...light=Pro+Comp
http://www.speedtalk.com/forum/viewt...pro+comp+heads
http://www.speedtalk.com/forum/viewt...pro+comp+heads
http://www.speedtalk.com/forum/viewt...heads&start=15
http://www.speedtalk.com/forum/viewt...pro+comp+heads
http://www.chevelles.com/forums/show...=1#post1345377
Alex
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