gungho

Wow, that is from June of 06,thats three years ago,is that all you got?????????,kinda sad when people bash because thats what they heard.

Tod74

Boy you sure are defensive...You must sell these heads.

I never bashed anything :roll: I said "Here is an opinion that should help you decide.... I posted that because Curtis Boggs is well respected in regards to cylinder heads.

A search on speedtalk will get you 50 plus results if you want to go read all about it...I don't care. I have seen a set in person and all I know from looking at them is the intake ports are very small...I don't mean runner volume I mean the opening...you can see it they are not as big as a stock GM rectangular port BBC head...so right off the bat they would have to be opened up ...maybe they fixed that since then I don't know and don't care.

gungho

Flow numbers as tested on a Super Flow Bench:

LIFT INT EX

.100 74.3 62.0

.200 166 118

.300 245 160

.400 308 195

.500 340 229

.600 360 248

.700 375 265

bubbabbc

In regards to the ProComp bbc heads that I have personally worked on, half were outright unacceptable, and returned. Of the sets that were kept, most needed considerable rework. This includes valve seats that were up to .025" off center of the valve guide. Also heads that had varying seat depth (stem height). Several heads needed seats replaced due to excessive depth and seat contact area too wide. Most of the time, the machined dimensions were consist from cylinder to cylinder in the same head, but varied too much as a set. I suppose someone could buy 20-30 sets and end up with 5-10 good pairs. But, unfortunately for the customer, shops don't work for free. The appealing low purchase price is soon gone due to needed rework. When you're all done, you're close to the price of Dart/Brodix/AFR, and the quality still isn't there.

Now, ProComp problems that I have personally seen, but didn't work on include valve spring seat pocket breaking through because of lack of material, which was caused by casting core shift. This occurred on a head that had springs for .635" lift. Also, a pair of heads that varied 3 cc in volume from head to head. These problems were observed at other shops, and then can complaints of many more additional problems with ProComp heads. I guess you could call that "lip flapping".

This topic was started with questions regarding using Pro Comp heads on an engine in the 700-750 hp range. I highly recommend staying far away from Pro Comp.

Finally, relate to us the personally experiences you have had with Pro Comp heads. How may sets have you worked on?

In closing, this is my position. I will set a customer Dart, Brodix, AFR, even Edelbrock. But I refuse to sell anyone a set of Pro Comp heads.
But then again, my customers don't race printed flow bench numbers. Maybe these heads are a bargain for bench racers.

bigray

Well,,bubbabbc .. i think you ansewered the mans question very well..thanks for the heads up..

gungho

Wow bubbabbc you are a big time engine builder I see this now,Please post up your website,so I can see your shop,products,ect.. thank you

bubbabbc

Gungho, you have a pm

hammertime

Id like the website also

bubbabbc

I'm not going to help this topic get into a bigger pissing contest than it already has. Bluesmoke asked for opinions concerning cylinder heads. I gave him my thoughts, and why. If he elects to pony up and buy quality heads, great. If he opts to go with the ProComps, that's ok too. I didn't try to sell him heads, and I didn't try to get his work. I'm certain whichever shop he chooses to do his engine will be glad if he goes with the proven heads.
Brotherton at Brodix, Mastin at Dart, and Sperling at AFR market quality cylinder heads because it's their love, not just their business. When they finish their production runs of bbc heads, they'll move on to sbc, or sbf. What is the Chinese factory gonna run next, sbc or 10,000 garbage disposal housings. I honestly don't know, do you?
When a company markets poor quality products or services, that not only hurt the customer, they also hurt the companies that provide quality parts and services. If a customer has a limited amount to spend on an engine, and he gets straddled with junk, it leaves him with bad feelings towards the industry in general.
If you have any further thoughts, concerns, or questions in regard to my opinions, contact me. Let's not bore everyone else with a personal debate. Sorry if I offended anyone, my intent was to offer bluesmoke my opinion on cylinder heads.

Skip Ohnmacht
www.portcitymachine.com

gungho

But again,you show no proof that procomp are junk,you just bowed out,this is why I asked,I would love to put my 540 with my junk heads against anything that you show on that website,btw I nor anyone I know that races ever heard of you,but when I said Nyes,they all but one said they heard of him,I wonder why that is????? well I do know why But I will keep my non fact based opinion to myself,as my mother taught me to do.again I just asked for you to back up your claims,as I also was intrested ,sorry for calling you out,I didnt mean to upset you. :0