Procomp aluminum heads/ kmj performance heads

[70chevybb]

I am interested in knowing if anyone has used these heads and if they are anygood ?

Thanks, Wes

[rspears]

I am interested in knowing if anyone has used these heads and if they are anygood ?

Thanks, Wes

Wes,
Not a BBC, but I had my engine done bySehr Performance Machine Engine Rebuilding Specialists and Scott likes the ProComp heads because they have a lot of meat to allow him to bowl port the chambers as he likes to do. However, he buys the bare heads, and then builds them up with quality valves, springs, retainers & rockers as opposed to buying complete units from ProComp. Not sure I would buy complete heads from them.

[Cdminter55]

Wes,
Not a BBC, but I had my engine done bySehr Performance Machine Engine Rebuilding Specialists and Scott likes the ProComp heads because they have a lot of meat to allow him to bowl port the chambers as he likes to do. However, he buys the bare heads, and then builds them up with quality valves, springs, retainers & rockers as opposed to buying complete units from ProComp. Not sure I would buy complete heads from them.

Why not answer the question Wes asked. The ProComp heads are Chinese imports that are not quality heads. If you are going to spend the money big block heads cost go with the top manufacturers not the bottom of the barrel. With this answer maybe there wouldn't be all this bickering in this thread.

[rspears]

Why not answer the question Wes asked. The ProComp heads are Chinese imports that are not quality heads. If you are going to spend the money big block heads cost go with the top manufacturers not the bottom of the barrel. With this answer maybe there wouldn't be all this bickering in this thread.

The bickering in this thread stopped well over four months ago, so the real question to me is,

Why is Cdminter55 dredging up old, out of date threads instead of posting up something of interest?

I'll stand by what I posted originally, the bare ProComp head provides a viable platform for a qualified engine builder/machinist to use to make a competitive set of heads using his knowledge and talent to bowl port the heads, and add quality valves, springs and retainers to build a set of heads. I would not put a complete, outfitted ProComp head against any other complete head and call them anything near equal. That said, a ProComp head, machined and built out with quality components, will be a viable alternative to other choices, IMO.

Now, instead of searching through the old threads and commenting on things that are ancient history (this guy decided to rework his current heads about six months back) maybe start a new thread?? What're you working on?

[70chevybb]

I finally picked up my .060 over 454 from the machine shop. Thet told me my crank needed to be turned. They had a .040on the main and .020 on the rod freshly turned forged crank for 150 bucks. I fugured that would be better than a cast crank kit for 339. I still havent made a decision on the heads but will most likley go with the stock cast iorn heads. Should I upgrade to 2.19 and 1.88 valves and do bronze guides? I do know I already need 1 exhaust seat put in so I think I should do all of them. I need a set of rods so I can get it balanced, should I just recondition the old rods or get a set of the eagle I beam rods?

[pat mccarthy]

I finally picked up my .060 over 454 from the machine shop. Thet told me my crank needed to be turned. They had a .040on the main and .020 on the rod freshly turned forged crank for 150 bucks. I fugured that would be better than a cast crank kit for 339. I still havent made a decision on the heads but will most likley go with the stock cast iorn heads. Should I upgrade to 2.19 and 1.88 valves and do bronze guides? I do know I already need 1 exhaust seat put in so I think I should do all of them. I need a set of rods so I can get it balanced, should I just recondition the old rods or get a set of the eagle I beam rods?

for the money you will tie up in this build you could of went 496 .hyper piston speed pro used many sets .cast steel crank . chevy rods rebuilt with Arp bolts or scat forged 6.135 rods . on heads ..if seen many valve jobs or alot of miles. more i go up to the 2.190. to help clean up heads . i would do all the ex seats if going big valve 1.880 make sure they only use a 1.937 O.D seat or you can cut threw the head

[1gary]

Hey Wes-with all the head companies out there,a direct answer is when you price shop and then expect to get something for nothing,this situation isn't any different than anything else you buy where you get what you pay for.

One certain fact is the lower dollar head companies DO NOT have the R&D programs that you pay of in the price in the bigger brand name companies.

The days of a neanderthal caveman with a die grinder thinking he can match yrs of flow-bench research and CNC porting is just a silly notion.For one thing to match port to port and let alone head is head with a die grinder the percentage isn't in favor of hand porting.

If you choose a BBC,you should do so understanding and accepting the heads are going to cost you alot more than a SBC.

[rspears]

C'mon now Gary, so you're calling a guy who makes his living building custom, high horsepower, high efficiency engines that hold several NHRA and Sprint Car records and has engines running Bonneville a "neanderthal (your spelling) caveman with a die grinder"? Geesh, I gotta say you've got some nerve.

[1gary]

C'mon now Gary, so you're calling a guy who makes his living building custom, high horsepower, high efficiency engines that hold several NHRA and Sprint Car records and has engines running Bonneville a "neanderthal (your spelling) caveman with a die grinder"? Geesh, I gotta say you've got some nerve.

Just the messenger Roger.I wish I could find the series of articles from the trades magazine Engines builder and how advanced porting has gotten,but some guys haven't.
We have had our share of national and regional wins.Surely you don't think I am guessing...........Hell all total I got what 50 yrs in drag racing and it's about time it is accepted.So it sounds like a duck and smells like a duck,well it's a duck.

[pat mccarthy]

there is things about the head i do not like .port size will not match any thing out of the box . head chamber will only seal with a 4.625 fire ring head gasket not to big of a deal were your useing a 4.600 bore bbc but i would never use them heads on any thing that big of bore the 396-496 so with a 4.125to 4.310 .that chamber is to far off . them two things stop me . there are many heads i can get and for the price i can get them for i have a very hard time wanting to spend added time on a sub quality part making it work when there is stuff out of the box that fits better

[1gary]

BTW-I posted at the same time or alittle after you Roger.So I didn't know what you said until afterwards.What gets me going is all those guys that with some head manufactures guy's who think they are getting "A Deal" and how much B.S. that really is.We campaign a RED and a 9.90 car that we built and on any given day I dare say we could and do win.

[rspears]

BTW-I posted at the same time or alittle after you Roger.So I didn't know what you said until afterwards.What gets me going is all those guys that with some head manufactures guy's who think they are getting "A Deal" and how much B.S. that really is.We campaign a RED and a 9.90 car that we built and on any given day I dare say we could and do win.

I'm sorry, Gary, but I'm not foolish enough to believe that you posted almost 15 minutes later and did not read the post. One or two minutes, maybe, but thirteen's a stretch. Regardless, it's not worth the time taken to type, so we'll call it done and gone.

Wes, you can trust what Pat McCarthy says 100%, especially anything having to do with a BBC. In fact, you'd be well advised to call him and see what he can do for you on a set of built out heads. He knows of what he speaks, and that's a fact.

[1gary]

I'm sorry, Gary, but I'm not foolish enough to believe that you posted almost 15 minutes later and did not read the post. One or two minutes, maybe, but thirteen's a stretch. Regardless, it's not worth the time taken to type, so we'll call it done and gone.

Wes, you can trust what Pat McCarthy says 100%, especially anything having to do with a BBC. In fact, you'd be well advised to call him and see what he can do for you on a set of built out heads. He knows of what he speaks, and that's a fact.

Honestly I am just shaking my head.You guys treat this like some sort of high school popularity contest.
I have spoken to Pat on the phone and I do indorse his advise as well.

One thing that you should take into account,is what I said.Most street driven cars don't know with a given choice they made is what they are missing.Well those that don't use a chassis dyno or on a given cruise night run into a guy who has matched everything up making you wonder why you don't run as good.

We have for many yrs in our parts business supplied god knows how many customers.

[pat mccarthy]

i deal with alot of dart heads for customers there is no free lunch on heads most of the big power guys we are useing Pro 1 cnc heads and there as good heads out there as darts RMS .Profile. AFR . are the makers that i would use if not for me getting the darts as i like money staying in MI or at least the USA. if i can ...as a engine builder i under stand the fact that there much cheaper heads and many guys want THE LOOK i given much thought of building a 496 crate engine with all the lower dollar stuff were the rub comes in as alot of the stuff is not worth the time getting it to fit

[1gary]

Roger-don't even think about calling me a lie'er.I didn't see you post until after mine.Remember me saying how the stroke I had effected my left hand slowing down my typing??.Well that is what happened and a fact.