Has anyone used the Pro Comp heads for BB's?

Need feed back. Looking to use a pair on a 489 street motor (625 HP). Do any of you have experience with them, or have you seen a set.:confused:

Has anyone used the Pro Comp heads for BB's?

Need feed back. Looking to use a pair on a 489 street motor (625 HP). Do any of you have experience with them, or have you seen a set.:confused:=
Have you tried the search function at the top of the page?
These things have been discussed to death
In my opinion out of the box they are a complete POS
And to get them right you will end up with damn near as much as a real set of heads would cost assuming decent parts are put into them,,, unless you happen to be Joe Mondello,,, :D

Here are a few posts along with a few comments I posted a while back to read & again if you use the search function you will find a wealth of information regarding a ton of subjects ;)

Hard to believe these things keep popping up.
They are a poor "copy" of the old Pro Topline head
They are cast & machined in China
They were originally sold by a guy in Australia & advertising would lead you to believe this is where they were made.
Not so
Probably imported by more folks directly now as this is what usually happens when it is found out there are enough people willing to buy junk if it is cheap enough.

Far as I know they have or are supposed to have stock valve angles.
Don't know if the ex is raised, only had one head in my shop & that one had a LOT of time in porting to get it decent
I have seen the small block ones
Guides all over the map, same with seats.

Sometimes you really do almost get what you pay for

Put one of these on a scale compared to a decent casting & it will scare you.

Here are a few comments by some of the best head people in the business among others,,

http://www.speedtalk.com/forum/viewtopic.php?t=4630&highlight=pro+comp+heads

http://www.speedtalk.com/forum/viewtopic.php?t=2079&highlight=pro+comp+heads

http://www.speedtalk.com/forum/viewtopic.php?t=2079&postdays=0&postorder=asc&highlight=pro+comp+heads&start=15

http://www.speedtalk.com/forum/viewtopic.php?t=3318&highlight=pro+comp+heads


Now, here are some results on a set I flowed for a member here a while back with comments & he had a lot of work in them.

Pro Comp heads with a lot of work.
Advertised as 320cc, Measured 338cc and 341cc,as cast
Ported as below they were 345cc and 349cc.

=========edit=========
THESE NUMBERS WERE AFTER SCOTT DID HIS WORK, NOT OUT OF THE BOX NUMBERS & I MUST ADD HE DID A HELL OF A JOB ON THEM :thumbsup:
===========================
4.530 bore, radius inlet, no pipe

bad port (3) good port (1)
in ex in ex

.050 43 32 52 37
.100 81 66 76 63
.200 159 125 151 131
.300 230 170 235 173
.400 295 198 299 208
.500 331 225 338 237
.600 359 248 361 259
.700 378 271 373 279
.800 391 293 381 293

those are my heads Mike gave the flow numbers for above. Those are not the out of the box flow numbers, Those have around 30 hours of bowl blend, port matching and mostly chamber work. I spent many hours blending the seats into the chamber floor and port.

The heads stock with a 3 angle valve job and as-is ports flow around 318 @ .600 and 333 @ .700.

Here is a link that explains what I found about them.
http://www.chevelles.com/forums/showthread.php?t=152315


Personally I dont think they are as horribly bad as everyone makes them out to be, but I like to tinker with stuff. However, buy time you pay for the machine work required to get the heads ready to assemble and buy the parts you are very, VERY close to what a brand name set of heads cost.
YOU CAN NOT ASSEMBLE THESE OUT OF THE BOX, machine work IS required. And unless you are going to run an oval port intake, the intake ports will need to be raised about 1/4 inch to get a good port match to a square port intake manifold.

The ports on the left are finished, the two on the right are as is. Compair to the top edge of the head and you can maybe tell how much the roofs need to be raised.
http://i133.photobucket.com/albums/q65/scottme/IMAGE040.jpg
Scott

those are my heads Mike gave the flow numbers for above. Those are not the out of the box flow numbers, Those have around 30 hours of bowl blend, port matching and mostly chamber work. I spent many hours blending the seats into the chamber floor and port.

The heads stock with a 3 angle valve job and as-is ports flow around 318 @ .600 and 333 @ .700.

Here is a link that explains what I found about them.
http://www.chevelles.com/forums/showthread.php?t=152315


Personally I dont think they are as horribly bad as everyone makes them out to be, but I like to tinker with stuff. However, buy time you pay for the machine work required to get the heads ready to assemble and buy the parts you are very, VERY close to what a brand name set of heads cost.
YOU CAN NOT ASSEMBLE THESE OUT OF THE BOX, machine work IS required. And unless you are going to run an oval port intake, the intake ports will need to be raised about 1/4 inch to get a good port match to a square port intake manifold.

The ports on the left are finished, the two on the right are as is. Compair to the top edge of the head and you can maybe tell how much the roofs need to be raised.

Scott

Hi Scott,
Thanks for posting, I edited my above post so it was less confusing, :)

Thanks for the help guys. I designed and produced the Indian Adventures Pontiav block, so machine work doesn't scare me. BUT...I'm looking for a good set of heads, not a project.

Thanks again for the info.:hurray:

Scott

What piston you runnin' in there?? :D

Scott

What piston you runnin' in there?? :D

That is a marine engine and they require extra piston to wall clearance:D

Actually that is an 84mm Honda piston, I was installing some Darton sleeves in a Honda block and the kid saw my Merlin on the stand and couldnt believe how big the bore was compaired to his Honda. The Merlin was 4.600 in that pic, its now 4.625 and just a few parts away from being ready to assemble. It will be 588ci with hyd roller and yup, you guessed it, Pro Comp heads. Looking forward to see how it all runs in my Camaro.

Thanks for the complement on my port work Mike. I have some 990s I,m working on now for my jet boat that I'd like to get flowed also if I can ever find the time to finish them.
Scott

Scott,

How'd it run w/ the reworked P/C heads?

pdq67

Thanks guys for the time/info !! Same here I"m looking for some good heads not a project/confusion.

those are my heads Mike gave the flow numbers for above. Those are not the out of the box flow numbers, Those have around 30 hours of bowl blend, port matching and mostly chamber work. I spent many hours blending the seats into the chamber floor and port.

The heads stock with a 3 angle valve job and as-is ports flow around 318 @ .600 and 333 @ .700.

Here is a link that explains what I found about them.
http://www.chevelles.com/forums/showthread.php?t=152315


Personally I dont think they are as horribly bad as everyone makes them out to be, but I like to tinker with stuff. However, buy time you pay for the machine work required to get the heads ready to assemble and buy the parts you are very, VERY close to what a brand name set of heads cost.
YOU CAN NOT ASSEMBLE THESE OUT OF THE BOX, machine work IS required. And unless you are going to run an oval port intake, the intake ports will need to be raised about 1/4 inch to get a good port match to a square port intake manifold.

The ports on the left are finished, the two on the right are as is. Compair to the top edge of the head and you can maybe tell how much the roofs need to be raised.
http://i133.photobucket.com/albums/q65/scottme/IMAGE040.jpg
Scott

the flow number you listed seems off the mark i had my engine builder flow them and he said they were good heads and flowed near 360 at 700 lift
he builds alot of engines dirt track and drag racing mostly and said for the money they looked ok, he also stated that the port didnt look like a 320cc but smaller like 310 maybe thats because the intake needs to be opened up 1/4" like you say. for a budget build i think they are ok, Ive heard good things and bad things about these heads.

the flow number you listed seems off the mark i had my engine builder flow them and he said they were good heads and flowed near 360 at 700 lift
he builds alot of engines dirt track and drag racing mostly and said for the money they looked ok, he also stated that the port didnt look like a 320cc but smaller like 310 maybe thats because the intake needs to be opened up 1/4" like you say. for a budget build i think they are ok, Ive heard good things and bad things about these heads.
=

Well, you may want to read a few opinions from some of the best head guys in the country ;)

Just follow the links I provided above,,,

And the ports were no where near 310, the numbers above are measured not guessed at by Scott as well as myself at least on this head

The only people I have seen defending these things are either trying to sell them, usually on Ebay,,, or already have them & are trying to convince themselves they got a deal.

As I stated I have seen both big & small block ones & I will pass :yes: