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post #31 of 68 (permalink) Old 09-05-2006, 05:02 PM
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Pro Comp heads

Scotty J,

I noticed this pro comp head on ebay item # 330025450066.It has 75 CC chamber 290 cc runner size 2.190 intake 1.71 exh. They are claiming 340 cfm on the intakes and 230 cfm on the exh. Is this a new head that pro comp has came out with or are they blowing smoke. I can't remember if the flow numbers were at 28 " or something lower. This may be another scam on evil bay .

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post #32 of 68 (permalink) Old 09-05-2006, 08:24 PM Thread Starter
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Re: Pro Comp heads

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Originally Posted by IDT-572
Scotty J,

I noticed this pro comp head on ebay item # 330025450066.It has 75 CC chamber 290 cc runner size 2.190 intake 1.71 exh. They are claiming 340 cfm on the intakes and 230 cfm on the exh. Is this a new head that pro comp has came out with or are they blowing smoke. I can't remember if the flow numbers were at 28 " or something lower. This may be another scam on evil bay .

Blake
Not a new head. Those numbers are very possible. At issue for me is the loss of low and mid lift flow that occures when the port is shaped for higher lift flow. Given the intended audience and use of these castings I feel it it more important to concentrate the flow curve from .100" to about .650". Hell I have the exhaust near 250 anyway and I am sure over time i will tweek and find a few more on the intakes.

Simply put it is a matter of porting for the application. I do not see these castings even comparing on a dyno to the fully worked TFS streets so why bother using / porting them to take the place of the tfs stuff.


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post #33 of 68 (permalink) Old 09-05-2006, 10:09 PM
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That is one hell of a good point Scotty.......hails.....D
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post #34 of 68 (permalink) Old 09-06-2006, 01:48 AM
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That's good to know, thanks Scott!

"I do not see these castings even comparing on a dyno to the fully worked TFS streets so why bother using/porting them to take the place of the tfs stuff. "
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post #35 of 68 (permalink) Old 03-07-2011, 10:51 AM
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Scotty I hope you don't mind but with all the questions about these heads I had decided to make a sticky so all can have informed info, after working on a new thread (then abandoning it) I decided to Stick this thread as there is a ton of useful facts in here.

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post #36 of 68 (permalink) Old 03-07-2011, 11:15 AM
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Thumbs up

Missed this thread during all my searching... This is indeed the information that I was after and I'm sure other people were too. Thanks for unearthing this thread!!
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post #37 of 68 (permalink) Old 03-07-2011, 12:25 PM
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It was back 12 pages when I did the search for the threads about them.

Eric Millard
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post #38 of 68 (permalink) Old 03-07-2011, 12:36 PM Thread Starter
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Cool

Quote:
Originally Posted by bigblok86ranger View Post
Scotty I hope you don't mind but with all the questions about these heads I had decided to make a sticky so all can have informed info, after working on a new thread (then abandoning it) I decided to Stick this thread as there is a ton of useful facts in here.
This is a pretty old thread. I have since discovered much additional information about wet flow, intake port flow bias being incorrect, etc etc. I am going to need to transfer some of the information in other threads I have posted information on to this thread. The original positive feelings i had about these castings have been tempered by the quality of flow issues, odd wet flow characteristics and poor flow bias discovered in the poorly engineered intake port.

Peter Ken the owner of procomp whom I had spoken with on a number of occasions at the time I originally posted this had a chance to make a really good cylinder head however he did not.

I will add to this as time allows...

For all who read this remember:

The PC castings is a decent replacement casting in aluminum for the D3 head.

It is NOT a high performance head like the TFS street nor is it a replacement for said TFS street.

The casting itself is actually quite good though the valve job, cheap parts and poor assembly technique that procomp utilised make the assembled castings a no go in my opinion. Most of the ebay versions of these castings are crap in my opinion. They are cheaply assembled and misrepresented.

If Randy Malick, myself or others here outfit the castings with good parts, add a good valve job, do some minor port work and what not they are not a bad head for say under 550 HP applications however in fully ported max effort trim they are lucky to be 5% better than a max effort pair of D0VE's. Again this is a quality of intake flow issue.



I will and hope Randy will entertain reasonable questions about these castings in this thread. I will not put up with any unnecessary bashing, BS or trouble making here. With that being said I hope we can give an honest asessment of them and put this constant sore spot to rest...


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post #39 of 68 (permalink) Old 03-07-2011, 12:50 PM
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Scotty if there is any bashing the posts will be deleted as I want this to be an informative thread. I appreciate any assistance in educating people on these heads you or Randy can or will provide as well as others.

Thank you!

Eric Millard
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post #40 of 68 (permalink) Old 03-07-2011, 02:29 PM
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best sticky ever!! and thanks to the mad porter for all his homework on these heads.

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post #41 of 68 (permalink) Old 03-07-2011, 03:29 PM
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I bought a set and will give them a try on my 472 as soon as time allows, should make a decent "street" head

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post #42 of 68 (permalink) Old 09-08-2011, 10:09 AM
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Quote:
Originally Posted by The Mad Porter View Post
This is a pretty old thread. I have since discovered much additional information about wet flow, intake port flow bias being incorrect, etc etc. I am going to need to transfer some of the information in other threads I have posted information on to this thread. The original positive feelings i had about these castings have been tempered by the quality of flow issues, odd wet flow characteristics and poor flow bias discovered in the poorly engineered intake port.

Peter Ken the owner of procomp whom I had spoken with on a number of occasions at the time I originally posted this had a chance to make a really good cylinder head however he did not.

I will add to this as time allows...

For all who read this remember:

The PC castings is a decent replacement casting in aluminum for the D3 head.

It is NOT a high performance head like the TFS street nor is it a replacement for said TFS street.

The casting itself is actually quite good though the valve job, cheap parts and poor assembly technique that procomp utilised make the assembled castings a no go in my opinion. Most of the ebay versions of these castings are crap in my opinion. They are cheaply assembled and misrepresented.

If Randy Malick, myself or others here outfit the castings with good parts, add a good valve job, do some minor port work and what not they are not a bad head for say under 550 HP applications however in fully ported max effort trim they are lucky to be 5% better than a max effort pair of D0VE's. Again this is a quality of intake flow issue.



I will and hope Randy will entertain reasonable questions about these castings in this thread. I will not put up with any unnecessary bashing, BS or trouble making here. With that being said I hope we can give an honest asessment of them and put this constant sore spot to rest...

As Scott has plainly said ... Castings are good and assembled heads, (unless done from bare castings and good parts), leave a lot to be desired. These are NOT an inexpensive race type cylinder head and shouldn't be though-of as such.
The combustion chambers are ugly but, don't present a performance problem.
They "are what they are" and are good heads IF they are kept within the parameters where they are meant to be used.
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post #43 of 68 (permalink) Old 09-08-2011, 11:28 AM
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What kind of flow bench? and what fixture and methods where used to collect the wet flow data?
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post #44 of 68 (permalink) Old 09-19-2011, 07:40 AM
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I did exactly that. I bought them bare, had my engine builder go over them. He did a little port work on the intake side. I bought all good name brand valves and springs. I have been running them in my 64 TBolt for 3 years and they have been fine. They provide plenty of power for me. I believe they are a good affordable aluminum street/strip head. All out racing, I would go for a more expensive head.
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Last edited by tbolt; 09-19-2011 at 07:59 AM.
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post #45 of 68 (permalink) Old 11-12-2011, 01:47 PM
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Boosted ProComp heads

What if they were used in a boosted application? That would sure improve the intake side of things. I don't need a max effort naturally aspirated head since I already have a Vortech YSI I would like to use with these. So what is anybody's thought on this?
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