[Iownastang]

Are pro comp heads any good, i hear that they are made in china and marketed throuh australia is this true.

[5literJeff]

Not alot of people around here like those things. I know I dont.

AFR or Trickflow: those are the heads people always talking about. Budget heads are usually gt40-ps which you can get off 97 1/2 explorers and up.

[Iownastang]

I am going with afr but but my uncle tried to get me to buy pro comp,I told him he was crazy(he's a chevy guy anyways) I didnt think they were anygood but I was just making sure.

[SALIV8]

afr? smart man

[ryans88gt]

I did a little research on these awhile ago.

Basically they are cast in china and machined in australia.
Pro-comp does not assemble them, so any assembled heads are put together by dealers. The problem is pro-comp doesn't require anything other than an order to become a dealer. So joe blow down the street can buy a bunch of casting for $300 a pair, assemble them with $100 worth of the wrong or just crappy components and sell them for $700. Adding to the problem is that the heads require +.100 valves and the geometry is set up for SBC rocker arms and it is no surprise that most of them are not assembled correctly.

You can see how they would get a bad reputation really quickly. The truth is, the bare castings are pretty good and if you are willing to spend a little time cleaning up the bowl area they will flow as good or better than victor jrs. Then assemble them yourself with quality components and you'll have a bargain of a head. I wouldn't buy these assembled from some guy on ebay.

[GOFAST]

Hello everyone,
well just joined the site and i wanted to be of some help in this question..


NO, "PRO COMP" HEADS AREN'T JUNK. TO BETTER EXPLAIN, PRO TOP LINE WERE CAST IN CHINA NOT "PRO COMP"(THEY ARE ACTUALLY CAST IN AUSTRALIA). IT WAS THE PRO TOP LINE HEADS THAT EARNED A BAD REPUTATION (DONT KNOW WHY). WHAT I CAN SAY ABOUT "PRO COMP",
IS THIS THEY DONT USE CHEVY ROCKERS JUST CHEVY PUSH ROD GUIDE PLATES THATS ALL. THE VALVE STEMS ARE .100 LONGER BUT I STILL USE 1.6 RATIO "FORD ROLLER ROCKERS". BUT LETS GET TO THE NITY GRITTY AT .600 THESE HEADS ARE FLOWING 281 CFM IN AND 206 CFM EX. THATS JUST OUT OF THE BOX. MY PARTNER WENT ALL OUT ON HIS HEADS AND THEY'RE FLOWING LIKE BIG BLOCK HEADS 370 CFM IN
AND 277.5 EX . IMAGINE THAT ON A SMALL BLOCK.

THIS IS WHAT I HAVE: 1993 MUSTANG CONVERTIBLE
408 ALL FORGED STROKER
W/ -28.5 CC DISHED PISTONS
210 CC PRO COMP HEADS (281 CFM IN 206 CFM EX) 60 CC
COPPER HEAD GASKETS (.62 THICKNESS)
9.1 COMP
COMP CAMS CUSTOM GRIND 501 L/IN 514L/EX 112 LSA ROLLER
1.6 RATIO ROLLER ROCKERS
TWIN TURBO
T56 EXTREME GEAR BOX
8.8 REAR W/327 31 SPLINE TRACTION LOCK
4 WHEEL DISK BRAKES
MASS AIR EFI
FOR A TOTAL OF 726 RWHP @ 18 PSI BOOST
( I ONLY RUN 8 PSI THIS THING SCARES THE S@## OUTTA ME.
WELL HOPE THAT HELPED.
LOOK UP DANNY AT M&R ENGINES, THEY SELL PRO COMP HEADS AND ENGINES TO AND THERE LOCATED IN CALI.

[TENGRAM]

Originally Posted by GOFAST Hello everyone, well just joined the site and i wanted to be of some help in this question.. NO, "PRO COMP" HEADS AREN'T JUNK. TO BETTER EXPLAIN, PRO TOP LINE WERE CAST IN CHINA NOT "PRO COMP"(THEY ARE ACTUALLY CAST IN AUSTRALIA). IT WAS THE PRO TOP LINE HEADS THAT EARNED A BAD REPUTATION (DONT KNOW WHY). WHAT I CAN SAY ABOUT "PRO COMP", IS THIS THEY DONT USE CHEVY ROCKERS JUST CHEVY PUSH ROD GUIDE PLATES THATS ALL. THE VALVE STEMS ARE .100 LONGER BUT I STILL USE 1.6 RATIO "FORD ROLLER ROCKERS". BUT LETS GET TO THE NITY GRITTY AT .600 THESE HEADS ARE FLOWING 281 CFM IN AND 206 CFM EX. THATS JUST OUT OF THE BOX. MY PARTNER WENT ALL OUT ON HIS HEADS AND THEY'RE FLOWING LIKE BIG BLOCK HEADS 370 CFM IN AND 277.5 EX . IMAGINE THAT ON A SMALL BLOCK. THIS IS WHAT I HAVE: 1993 MUSTANG CONVERTIBLE 408 ALL FORGED STROKER W/ -28.5 CC DISHED PISTONS 210 CC PRO COMP HEADS (281 CFM IN 206 CFM EX) 60 CC COPPER HEAD GASKETS (.62 THICKNESS) 9.1 COMP COMP CAMS CUSTOM GRIND 501 L/IN 514L/EX 112 LSA ROLLER 1.6 RATIO ROLLER ROCKERS TWIN TURBO T56 EXTREME GEAR BOX 8.8 REAR W/327 31 SPLINE TRACTION LOCK 4 WHEEL DISK BRAKES MASS AIR EFI FOR A TOTAL OF 726 RWHP @ 18 PSI BOOST ( I ONLY RUN 8 PSI THIS THING SCARES THE S@## OUTTA ME. WELL HOPE THAT HELPED. LOOK UP DANNY AT M&R ENGINES, THEY SELL PRO COMP HEADS AND ENGINES TO AND THERE LOCATED IN CALI.

why do i get the feeling you're just trying to sell something? :lala

BTW,

[woody1]

LOL 370, now thats funny. A close friend of mine goes through 25-30 pairs per month for another company, 1 out of 5 pairs on average are junk and unusable. Looks guides, sunken seats, valve jobs done by woodchucks etc.

[ryans88gt]

They are cast in china, noone is confusing them with pro top line.

*read with bad chinese accent* Pro comps the best cast in China. Parent company Pro comp electronics bases in China. If you no believe, you have read their catalog. Although it not bad, there are numerous Chinese-to Englishes grammars mistakes. I find catalog very funnys, ha ha ha.


All kidding aside, they are cast in china and machined in Australia, no matter what the people selling the heads tell you. They are made for Chevy 1.6 rocker arms geometry. Ford rocker arms will work, but in many cases they will cause rubbing issues (which is why you needed chevy guide plates I am guessing). As cast, there is a lot of variability in the runners, so they do require some work. And as i stated, you would not be smart to buy them assembled.

[ryans88gt]

Originally Posted by woody1 LOL 370, now thats funny. A close friend of mine goes through 25-30 pairs per month for another company, 1 out of 5 pairs on average are junk and unusable. Looks guides, sunken seats, valve jobs done by woodchucks etc.

I don't believe this either, who is your friend? Any statement that starts with "a close friend of mine says" is almost alway BS. So I am throwing the BS flag on this one.
They have hardened seats installed and why would the seats be sunken before they are even run? How could the valve guides be loose on one set out of five. I believe that the valve jobs look like crap, that is how a lot of the aftermarket heads are delivered from many different manufacturers.
Pro-comp heads get their questionable reputation from shady business practices, like letting any joe blow become a dealer and assemble the heads with the wrong and/or crappy parts. The castings themselves are well worth the price paid.

[TENGRAM]

Originally Posted by ryans88gt Originally Posted by woody1 LOL 370, now thats funny. A close friend of mine goes through 25-30 pairs per month for another company, 1 out of 5 pairs on average are junk and unusable. Looks guides, sunken seats, valve jobs done by woodchucks etc. I don't believe this either, who is your friend? Any statement that starts with "a close friend of mine says" is almost alway BS. So I am throwing the BS flag on this one. They have hardened seats installed and why would the seats be sunken before they are even run? How could the valve guides be loose on one set out of five. I believe that the valve jobs look like crap, that is how a lot of the aftermarket heads are delivered from many different manufacturers. Pro-comp heads get their questionable reputation from shady business practices, like letting any joe blow become a dealer and assemble the heads with the wrong and/or crappy parts. The castings themselves are well worth the price paid.

wrong person to "throw the bs flag" up on. :wink

[woody1]

Im just a nobody that makes things up as I go along, I will leave it at that.

[ryans88gt]

Originally Posted by woody1 Im just a nobody that makes things up as I go along, I will leave it at that.

Well something more solid than a friend of mine says would be nice. Saying that 1 in 5 heads is trash without providing anything more than "my friend said so" deserves a BS flag.
If you have any real evidence like some pictures of these sunken valve seats or loose valve guides we'd all love to see them. Heck, even the name of you close friend would be nice.

I have a rather Descartes philosophy when it comes to these things. If you want me to believe, then show me.

I've had one engine builder tell me that scat cranks are shit and that he'd never use them. I ask him how many he has worked with and he says, well none, but my friend said so. Then another engine builder that builds NASCAR engines says Eagle cranks are crap. How many have you worked with? His answer, "um, one or two." You see my point. Lots of people have opinions on parts that they have no experience with whatsoever. I don't count third hand experience.

[woody1]

Originally Posted by ryans88gt Originally Posted by woody1 Im just a nobody that makes things up as I go along, I will leave it at that. Well something more solid than a friend of mine says would be nice. Saying that 1 in 5 heads is trash without providing anything more than "my friend said so" deserves a BS flag. If you have any real evidence like some pictures of these sunken valve seats or loose valve guides we'd all love to see them. Heck, even the name of you close friend would be nice. I have a rather Descartes philosophy when it comes to these things. If you want me to believe, then show me. I've had one engine builder tell me that scat cranks are shit and that he'd never use them. I ask him how many he has worked with and he says, well none, but my friend said so. Then another engine builder that builds NASCAR engines says Eagle cranks are crap. How many have you worked with? His answer, "um, one or two." You see my point. Lots of people have opinions on parts that they have no experience with whatsoever. I don't count third hand experience.

Ok final reply from me on the pro comp head. My friend who I have know for the last 13 years, who I talk with on a 3 times per week basis, has X company send him 25-30 pairs per month. He is paid to inspect the bare castings, do the valve job and send them back to X company. In our talks we have touched upon the prop comp head, according to him he rejects 1 out of 5 pairs for core shift, paper thin pushrod pinch area, loose guides and uneven seats. Is he lying to me? Fuck if I know, my hunch is he's not!

Do I have pictures? No but I suppose I could call him and ask for pics because ryans88gt on moddedmustangs doesnt believe me. :sleep On the flipside if you think the only problems with the pro comp head is the junk parts that ebay dealers put into them, then you are the naive one.

Im done

[ryans88gt]

Every head manufacturer has controllable variation in their parts and occasionally EVERY head manufacturer has heads that were outside of those limits reach the public. I'm sure there are pro-comp heads that are outside of the tolerances that people would like to accept. Do I think 1 in 5 is a gross exaggeration propagated by third hand conversation and reported by someone that may or may not have ever even seen a pro comp head??? Well to be truthful, I don't really care, I just hate it when people spout off third party speculation like it is fact. Also, it is really hard for me to believe you don't even know your friends name after 13 years of friendship... :sleep :sleep :sleep

[TENGRAM]

Originally Posted by ryans88gt Every head manufacturer has controllable variation in their parts and occasionally EVERY head manufacturer has heads that were outside of those limits reach the public. I'm sure there are pro-comp heads that are outside of the tolerances that people would like to accept. Do I think 1 in 5 is a gross exaggeration propagated by third hand conversation and reported by someone that may or may not have ever even seen a pro comp head??? Well to be truthful, I don't really care, I just hate it when people spout off third party speculation like it is fact. Also, it is really hard for me to believe you don't even know your friends name after 13 years of friendship... :sleep :sleep :sleep

he's keeping that friend's name out of it for obvious reasons. the guy is paid to inspect and do work on these heads and would not want his name posted in a thread bashing them.

you need to consider the quality of the source when you call someone a liar. sure you've never heard Woody's name in this tiny corner of the internet but if you ventured out of this hole you'd see he is very well known and has built more engines than you've ever seen. furthermore many of the friends he has are also VERY well known. these guys are not BSers, they are professionals. Woody is a nice guy otherwise he would rip you apart and belittle you for your lack of knowledge and experience.

[woody1]

Originally Posted by TENGRAM Originally Posted by ryans88gt Every head manufacturer has controllable variation in their parts and occasionally EVERY head manufacturer has heads that were outside of those limits reach the public. I'm sure there are pro-comp heads that are outside of the tolerances that people would like to accept. Do I think 1 in 5 is a gross exaggeration propagated by third hand conversation and reported by someone that may or may not have ever even seen a pro comp head??? Well to be truthful, I don't really care, I just hate it when people spout off third party speculation like it is fact. Also, it is really hard for me to believe you don't even know your friends name after 13 years of friendship... :sleep :sleep :sleep he's keeping that friend's name out of it for obvious reasons. the guy is paid to inspect and do work on these heads and would not want his name posted in a thread bashing them. you need to consider the quality of the source when you call someone a liar. sure you've never heard Woody's name in this tiny corner of the internet but if you ventured out of this hole you'd see he is very well known and has built more engines than you've ever seen. furthermore many of the friends he has are also VERY well known. these guys are not BSers, they are professionals. Woody is a nice guy otherwise he would rip you apart and belittle you for your lack of knowledge and experience.

Bah, im done with this one bud, no biggie. I make up shit as I move from forum to forum

[GOFAST]

WELL, THIS HAS TRULY TURNED INTO A BS DEBATE... HE SAID HE SAID, BLAH BLAH.
ONE THING IS CERTAIN " DON'T KNOCK THEM TILL YOU TRIED THEM"
NO I'M NOT SELLING ANYTHING MY JOB IS TO DESIGN THE MOST POWERFUL, YET EFFICIENT ENGING, TRANS AND REAR END COMBO'S FOR ANY CAR HENCE THE THE NAME, GOFAST. I DON'T CARE WHAT OTHER PEOPLE THINK, I HAVE A SET OF MY OWN AND THEY WORK BEAUTIFULLY. WHAT I REALLY BELIEVE IS THAT BECAUSE THEY ARE NOT MADE HERE IN AMERICA SOMEBODY HAS SOMETHING NEGATIVE TOO SAY.

I DRIVE MY CAR EVERYDAY 60 MILES TO AND FROM WORK AND I HAVE NOT HAD ANY PROBLEMS.
IF YOU PURCHASE SOMETHING FROM ANYWHERE EBAY,SUMMIT JEGS AND YOU DONT PURCHASE THE CORRECT VALVETRAIN FOR YOUR APPLICATION DISASTER IS BOUND TO HAPPEN.
OH YEAH FORD ROCKERS WORK GREAT, LIKE THEY ARE SUPPOSE TO.
HEY GENTLEMEN OR WOMEN IF IT APPLIES,
I WISH ALL THE BEST...

[ryans88gt]

Originally Posted by TENGRAM you need to consider the quality of the source when you call someone a liar. sure you've never heard Woody's name in this tiny corner of the internet but if you ventured out of this hole you'd see he is very well known and has built more engines than you've ever seen.

I've heard of fordstrokers.com before. I never called anyone a liar. I said it was BS. It may be his friends BS or his, it doesn't matter to me really. I personally don't base the factuality of a statement on the number of engines someone has built. I don't listen to anyone blindly unless they appear in front of me as a burning bush. Since that hasn't happened so far, I'll go ahead and keep thinking for myself. You can listen to anyone blindly if you want, but think about this, for every builder that praises a certain manufacturer there is another builder that hates those parts. Engine builders are notoriously closed minded when it comes to what parts they'll use, even if they've never tried the other manufacturer's parts. That's why it is important to see for yourself and talk to more than one person. I have talked to several reputable sources about these heads and have heard that the castings have no core shift issues and are overall good castings that require valve jobs and sometimes bowl work and minor casting clean up. I have yet to see a set with sunk in seats, core shift, or loose valve guides. I'd love to see a picture of a single bad casting, because out of all the ones I've seen, I haven't yet seen one. With all these bad heads (1 in 5, right?), the internet should be literally teaming with pictures of sunken valves, bad guides, etc... 1 in 5 means that 20% of all of pro comp's end users would end up with bad heads. Where are all the dissatisfied users? Furthermore, why would any company continue to buy a product that required 20% of the product be returned?

Have I knocked enough holes in this BS story yet, or do you need more?

[ryans88gt]

It really irks me when someone decides to make a profound statement that they claim to be fact. Then when someone asks for more evidence, all they do is say it isn't worth the effort. If it wasn't worth the effort then don't post it in the first place. If your opinion isn't worth defending, then it isn't worth having.