does anyone know anything about procomp heads - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-22-2006, 02:23 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 481
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
does anyone know anything about procomp heads

I was looking at putting some aluminum heads on a 427 bbc. Right know I have stock heads that had had some work done to them. Does anyone know anything about procomp heads? Any help would be appreciated.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-22-2006, 02:27 PM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 69
Posts: 7,379
Wiki Edits: 3

Thanks: 48
Thanked 151 Times in 143 Posts
here are some threads on those..
http://www.hotrodders.com/forum/sear...earchid=631453

Sam
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-22-2006, 08:53 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 481
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
procomp heads

I tried your link and it said there was no matches
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-23-2006, 10:14 AM
King of my Man-cave.
 
Last photo:
Join Date: Nov 2003
Location: Michigan
Age: 55
Posts: 2,899
Wiki Edits: 0

Thanks: 3
Thanked 15 Times in 12 Posts
Here is a discussion on who makes different heads:

http://www.speedtalk.com/forum/viewtopic.php?t=2079

tom
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-23-2006, 10:18 AM
nitro_baller4692's Avatar
floppers forever
 
Join Date: Jun 2006
Location: illinois
Posts: 791
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
look at the dart heads you will be happy
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-23-2006, 06:18 PM
72NOVA454
 
Last photo:
Join Date: Nov 2004
Location: chicago area
Age: 51
Posts: 922
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
I wouldnt use anything from Procomp. Shy away from that brand. I made that mistake once to save a few bucks. will never do it again.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-23-2006, 06:52 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 481
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ok great thanks for all the info. If I decide to upgrade I will definatly look at something else besides pro comp
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-17-2010, 09:54 AM
Registered User
 
Join Date: May 2010
Location: National City
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pro Comp.... Bad News

I have a '70 El Camino with a 6-71 blower and formerly ran aluminum GM Performance rectangle ports. I used these heads for about 7 years without a hitch. I recently went to the machine shop to freshen up the heads and they told me that several of the guides were worn and the bill would be in the $700 range. I looked for some alternatives and found Pro Comp. I did check out several forums to see if there were any reported issues but the only negative things I saw were minor appearance issues or Australian/Chinese bashing which is not issue specific. Well, I have an issue specific complaint that you had better read. After installing the same type valve/spring combo that worked flawlessly on the GM Performance heads I took the car out for it's test drive. About 10 min. in town and then mild acceleration (no more than 3300 rpm) to get to freeway speed and then cruise at 3000 rpm for about 5 miles to get back to my off ramp. By the time I reached my off ramp I started hearing what sounded like mild knocking. Engine rpm at this point is about 1800 rpm. Checked oil pressure and that was at 64 psi. I then went to shut off the engine but before I could there was some really bad rattling and then the engine stopped. We all know it's NEVER good when that happens. Removed the heads and discovered that every single piston had come in contact with the valves and the number two intake valve was actually snapped off and ended up in the number 6 intake port. I have tried two progressively stouter valve and spring combinations with EXACTLY the same result. I won't even tell you about my Pro Comp distributor nightmare but that piece of crap ended up in the trash. I hope my experience helps others not to buy Pro Comp because my experience with both heads and distributors has been a very, very bad one
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-17-2010, 05:27 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,400
Wiki Edits: 0

Thanks: 29
Thanked 471 Times in 428 Posts
Quote:
Originally Posted by dgravagn
I have a '70 El Camino with a 6-71 blower and formerly ran aluminum GM Performance rectangle ports. I used these heads for about 7 years without a hitch. I recently went to the machine shop to freshen up the heads and they told me that several of the guides were worn and the bill would be in the $700 range. I looked for some alternatives and found Pro Comp. I did check out several forums to see if there were any reported issues but the only negative things I saw were minor appearance issues or Australian/Chinese bashing which is not issue specific. Well, I have an issue specific complaint that you had better read. After installing the same type valve/spring combo that worked flawlessly on the GM Performance heads I took the car out for it's test drive. About 10 min. in town and then mild acceleration (no more than 3300 rpm) to get to freeway speed and then cruise at 3000 rpm for about 5 miles to get back to my off ramp. By the time I reached my off ramp I started hearing what sounded like mild knocking. Engine rpm at this point is about 1800 rpm. Checked oil pressure and that was at 64 psi. I then went to shut off the engine but before I could there was some really bad rattling and then the engine stopped. We all know it's NEVER good when that happens. Removed the heads and discovered that every single piston had come in contact with the valves and the number two intake valve was actually snapped off and ended up in the number 6 intake port. I have tried two progressively stouter valve and spring combinations with EXACTLY the same result. I won't even tell you about my Pro Comp distributor nightmare but that piece of crap ended up in the trash. I hope my experience helps others not to buy Pro Comp because my experience with both heads and distributors has been a very, very bad one
Sounds like you never checked valve to piston clearance when you changed to the ProComp heads and just expected that the clearance would be the same as with the previous GM heads. All the valvespring changing in the world won't change a thing there.

The ProComp heads have worked fine for me. two sets now, but they are not for "parts installers", you need to know what to look for and check as the manufactureres QC does not have a good rep.

I never buy them complete, as the Procomp valves and springs/retainers are pretty poor pieces. I buy them bare and pick the parts used to complete them myself.

I agree to stay away from Procomp distributore and electronics.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-17-2010, 05:56 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,762
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Pro Comp: Junk? This link will work read away.


Cole
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 05-17-2010, 07:41 PM
Registered User
 
Last photo:
Join Date: Mar 2010
Location: kansas
Posts: 274
Wiki Edits: 0

Thanks: 0
Thanked 4 Times in 4 Posts
just took mine to the machine shop had them disasembled checked spring heigth, spring pressure, valve guide clearance and seats the installed heigth was not as advertised. shimmed .090 spring pressure was what they said at the heigth they adv. seats good ,1 peice swirl polished valves ,10# locks, valve to guide clearance good. I bought these complete. i see were there advertised with different valves and springs for the same money. An 8 dollar valve is a 8 dollar valve no matter what. they arn't putting anything any better than what is in them . probably made in the same place with a different name.there not going to put in 20.00 valves and better springs and retainers for the same. i thought it was pretty much standard procedure to check valve to piston clearance? and also how the rocker arm rides on the valve. stupid mistakes that can be easily avoided. I have talked to them and they will tell you what you have to check for. and have talked to plenty of people that are running the crap out of them.They have been in business for awhile. If they were that bad don't think they could still be selling the crap out of them
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 05-17-2010, 08:24 PM
Registered User
 
Join Date: May 2010
Location: National City
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Pro Comp

This is for EricNova72. I will always admit if I haven't checked something and Eric, you're right. I did not check the piston to valve clearance because I'm only running a .600 lift cam with the standard 1.7 rockers. I will check that clearance and get back to you. Thanks for the input.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 05-17-2010, 09:08 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,400
Wiki Edits: 0

Thanks: 29
Thanked 471 Times in 428 Posts
Quote:
Originally Posted by dgravagn
This is for EricNova72. I will always admit if I haven't checked something and Eric, you're right. I did not check the piston to valve clearance because I'm only running a .600 lift cam with the standard 1.7 rockers. I will check that clearance and get back to you. Thanks for the input.
I would be looking not so much at depth of valve relief in piston as it relates to V-P clearance and more at radial clearance between the edge of the valve and the valve relief in the piston. Bigger valves or slightly modified valve angles(many aftermarket heads are this way) will create problems here with a lot of pistons.

Peak lift really has little to do with V-P clearance, the piston is far from the valve at max lift. The danger area is cam duration combined with the amount of lift occuring 10-15 either side of TDC(the overlap event when both valves are open). At this point the intake valve and the piston are moving toward each other, this is when things get tight.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-31-2013, 12:19 PM
Registered User
 
Join Date: Jan 2013
Posts: 1
Wiki Edits: 0

Thanks: 3
Thanked 0 Times in 0 Posts
Sounds like U don't under stand the basics to engine building !!
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
AFR or Vortec heads? Cam? rodent Engine 18 06-08-2010 03:50 PM
Which Heads to use? Mike_82 Engine 9 03-05-2009 10:32 PM
sbc heads shieldbreaker Engine 5 08-27-2005 08:12 PM
Heads and Intake combo black66 Engine 4 07-23-2005 11:33 PM
looking for some head(s) now i'm gonna explode! bullheimer General Rodding Tech 25 04-12-2004 01:16 PM


All times are GMT -6. The time now is 10:47 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.