Yep Big Joe, I am now a believer. I have never seen anyone perform a comparison swap before and so I structured my winter rebuild with minimal changes just to prove or disprove whether there was a difference. My ProComps had good hardware, pocket porting, and some other port work done. I also opened up where the pushrod goes through. They seemed to run fine and I never had any running type problems with them, but the motor never really performed up to my expectations on 2 separate builds and 80 or so runs at the track. Clean up the cylinder bore, swap on the AFR's and suddenly the car made more mph on its first outing than it anytime all last year.

The lesson learned is that if you are going to spend your hard earned $$ on heads, buy a quality one from one of the other major manufacturers and skip over the ProComp quap.

Anyone looking for a deal on a cheap pair of aluminum heads?

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Dennis
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65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.25@122.19mph