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#11
10-17-2013, 01:29 AM
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Re: pro comp heads
Thanks for the responces guys. I have a set of 049 oval port heads. I think i will just get those done. Im building a 68 chevelle 427 bored .030 over with a m21 muncie with 3.73 12 bolt rear, with a hotchkis 4 link rear.
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1968 Chevelle 427 BBC Muncie 4 speed Rats Rule 
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#12
10-17-2013, 07:10 PM
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Re: pro comp heads
1968BM, I would NOT run Pro Comp ANYTHING, let alone heads. FYI for what it's worth, I have a .030 427 with closed chamber oval heads. Nothing fancy or special. Really just a L-88 with better solid NOT roller cam, ported oval port heads, holley intake. Street car @ 3500 lbs HAS run 10.40's in a '69 Nova. Hadmore in it but got booted for no roll bar.
Now we have another 427 .030 over, 12.5 to 1 with roller came, ported sq port heads on a factory dual plane intake that makes north of 700Hp with the roundy-round cam. Car runs 500 mile endurance races. Just use the factory heads, nice RPM air-gap intake with a mild cam and you'll be better off.
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'58 Apache pick up '78 Z28 4sp being restored '70 W30 convert TRIBUTE '78 Z28 32,000 survivor, Og Yellow paint, AC. '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW)
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#13
10-17-2013, 07:36 PM
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Re: pro comp heads
I believe it was Popular Hot Rodding or Hot Rod that did an excellent test of aftermarket Chevy aluminum heads showing the cost, how well they performed on the same test engine, etc. a few months ago. I will have to dig up that article and see if I can post the results here.
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1968 Camaro Ex-ISCA Show Car John 10:30
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#15
10-28-2013, 12:46 AM
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Re: pro comp heads
I work on three drag cars and one has a set on. We found out the seats are junk like everyone else has said. I also found out that the rockers were not all lined up to hit the valve stem correctly. Only if you get a smoking deal on a used seat and have plenty of extra money to replace the seats and put new valves in that is the only way I would recommend them. One of the cars has Brodix BB2s on it and they work awesome. I bought an extra set of Pro Comp CNC ported heads for $175 that dropped a valve and pushed into the intake runner. The owner of the car is a certified welder specializing in aluminum. So no big deal for us. They flow good and can make big power. We have a 489 making 660 hp with a Comp hydraulic roller. But Pro Comp heads have issues out of the box.
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1967 Camaro conv (first car) 1969 Camaro street car 1967 Super Stock SS/JA Joe Scott car
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#16
10-28-2013, 01:00 AM
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Re: pro comp heads
Sorry it took me so long to find the article. We had a party at our house and some stuff got moved around.
It was in Car Craft: http://www.carcraft.com/techarticles...t/viewall.html
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1968 Camaro Ex-ISCA Show Car John 10:30
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