2000PewterT/A

So far these don't seem to be consistent in any way shape or form with what they are advertized as, at least according too the 2 post above me.

1990LSx

iTrader: (9)

you will find some inconsistencies with just about every head. I am not worried one bit if the deck surface was thicker than expected as long as they flowed the numbers I purchased them for.

showvette

OK... Here's the whole story about these Procomp heads. In a nut shell, they suck! I took them to have them flow benched, and to say they didn't come close to advertised numbers is an understatement. I took them to the same shop that have flowed other heads for me previously. They do alot of Pro Mod head work. How far off were they? Procomp claims 291/203 @ .600". These heads actually flowed 270/168 @ .600". The exhaust only flowed 174 @ .750"!. Max intake @ .700" was only 274! I was also told the valve job was terrible. The exhaust flow on these is actually WORSE than stock 241s. A 241 flows 198 @ .600" on the exhaust. These are going back and I'm sending my 241s to Lloyd Elliot. My advice is to stay away from this Procomp junk.

Frank

studderin

iTrader: (28)

so there not some killer race part thats alot cheaper then others! OMG

I thought that other thread said how "nice" they looked? dont that matter for anything? there CNC ported you know, must be good

stevecritt

iTrader: (3)

I runs a set of cnc ls3 procomps , on a 408 and the car trapped 123 in the 1/4 full weight f-body. granted they were stock pc castings cnc'd by walker racing, flowed 360 at 600. I don't see why everyone always bashes them, especially when most have not even ran them. I know some have and have not had luck. But I really believe that number is much less than the ones who have had good luck.

stevecritt

iTrader: (3)

oh yeah and that 123mph was through a t56 on stock rims and tires. just saying, car would not run like that if they weren't decent heads.

96capricemgr

iTrader: (1)

cnc'd by someone else could correct a poor design and luck could get you past bad QC

stevecritt

iTrader: (3)

true, but I still only payed 1300 fully assembled with dual valve springs. can't beat that deal. all i got to say. lol

96capricemgr

iTrader: (1)

thinking you could do just as well with 243s ported for similar coin.

stevecritt

iTrader: (3)

you have to be joking.

studderin

iTrader: (28)

or stock LS1 heads

stevecritt

iTrader: (3)

I'm not even seeing the real potential of these heads with the baby cam I'm running. You can't tell me 241/243s would be better even ported to the maxxx!. yall are crazy.

roninsonic

iTrader: (3)

I've read a LOT of reviews about their crappy QC... But I've never used a set, so I dunno. I'm spoiled, I have AFR's lol

96capricemgr

iTrader: (1)

I am not that up on the LS stuff but I do know there are heads/cam LT1 carS running near that, 350s with ported GM 23degree stuff.

I would expect more from a aftermarket head stroker LS.
Hell some of the porting programs for 243s have been tested better than CNC'd quality aftermarket castings

stevecritt

iTrader: (3)

I would like to see that info, as far as after market ls3's and ported 243's are concerned. (no disrespect) and again, that a hell of a trap speed with a 2.6 60ft with a m6 and 3.42 rear. I can't even touch the throttle hard until I'm out of 1st and half way into 2. just lights up the tires.

AINT SKEERED

iTrader: (2)

My lq4 bottom end and mildly ported 241's with f14 can traps 122 with 10.3/1 compression at 3850 lbs on 17" wheels .
That 408 should do better

96capricemgr

iTrader: (1)

There are a handful of LT1s with stock shortblocks trapping 118-122mph just heads and cam, not news atall well documented.

I am sure the poster has not put an ET in his sig because it runs 10.0 in street trim and he is making a living street racing for cash.

MillsMotorvation

All I can say is Ive run a lot of Procomp stuff, and I have no problem with there parts! There price is better than most. A lot of company buy there stuff stamp there name on it, and jack up the price! Just ordered cnc heads, and Hot Rod showed where they out performed AFRs. Also I have seen some high dollar heads come messed up, so Im sure they may have that problem just like high dollar parts! Ill try them if they don't do well it wont hurt as much as a 2500 set. I got friend that only shop at the mall for the name brand stuff, Im not that guy! Try it if you want!

ls1 down under

I have a set of the pro comp 3017 fully cnc 225 64cc bare no valve job heads (for 2.02 /1.55 valves). I have only just received these from speedmaster but I can tell you that mine certainly do not look anywhere near as bad as the ones showvette posted pics of. Mine look fairly decent. I have had tsp cnc heads before and even with them I still sent them to my cylinder head guy to hand finish them and flow them. These pro comp heads will be no different. For the price they are a good base to go on and for the extra couple hundred bucks , they will be hand finished to suit the lift of my cam.

The tsp heads flowed @566.4hp so be interesting to see what the PC ones flow.

.boB

iTrader: (1)

Pro Comp parts are cheap chinese knock off's of American developed parts. You get what you pay for (if you're lucky). There is no place on my race car for Pro Comp parts.

Never buy cheap parts. They're too expensive.