#1  
Old 09-11-2019, 11:44 PM
Dragncar Dragncar is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Humbolt County California
Posts: 8,283
Default Heads, whick one cools the center ex the best ?

Is there a consensus with the aftermarket PMD style heads as to which ones have the best cooling around the center exhaust ?
Is there much of a difference ? Tiger, High Port E head ect.

  #2  
Old 09-12-2019, 05:56 AM
steve25's Avatar
steve25 steve25 is online now
Ultimate Warrior
 
Join Date: May 2008
Location: Westchester NY
Posts: 14,633
Default

The E head pro port with its coolant feed hole in the center of the head.

A thermal coating applied inside the center ports on any head (especially Aliuminum) helps a good amount with burning head gaskets and extremes of thermal expansion that takes place there to chew up the head gasket over time.

__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!
  #3  
Old 09-12-2019, 08:49 AM
slowbird's Avatar
slowbird slowbird is offline
Ultimate Warrior
 
Join Date: Jan 2001
Location: Montgomery, IL
Posts: 10,638
Default

Quote:
Originally Posted by steve25 View Post
The E head pro port with its coolant feed hole in the center of the head.

A thermal coating applied inside the center ports on any head (especially Aliuminum) helps a good amount with burning head gaskets and extremes of thermal expansion that takes place there to chew up the head gasket over time.
So how much did the coated exhaust ports extend the life of head gaskets in your testing?

  #4  
Old 09-12-2019, 01:22 PM
Dragncar Dragncar is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Humbolt County California
Posts: 8,283
Default

Quote:
Originally Posted by steve25 View Post
The E head pro port with its coolant feed hole in the center of the head.

A thermal coating applied inside the center ports on any head (especially Aliuminum) helps a good amount with burning head gaskets and extremes of thermal expansion that takes place there to chew up the head gasket over time.
Available heads. Is there a difference ?

  #5  
Old 09-13-2019, 05:58 AM
steve25's Avatar
steve25 steve25 is online now
Ultimate Warrior
 
Join Date: May 2008
Location: Westchester NY
Posts: 14,633
Default

Can't say slowbird as the head gaskets have yet to fail, but test with a thermal gun show 45 degree drop in temp at the junction of the spark plug hole roll over point and the head surface just above the deck of the block.

__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!
  #6  
Old 09-13-2019, 06:06 AM
steve25's Avatar
steve25 steve25 is online now
Ultimate Warrior
 
Join Date: May 2008
Location: Westchester NY
Posts: 14,633
Default

In regards to common available aftermarket heads I can't say , but I would tend to think that a factory iron Block with its far greater gap in between each Bore and hence coolant flow would cool the center of the motor down each bank better then a aftermarket Siamese Bore block , or a near Siamese Bore block .
Just guessing here!

You can apply the same added center hose deal as the E pro port heads even to factory iron heads no less aftermarket heads.

The iron heads have plenty of wall thickness to drill and tap a 1/2" pipe hole in the side wall of the heads.

__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!
  #7  
Old 09-13-2019, 01:11 PM
chiefbigb chiefbigb is offline
Ultimate Warrior
 
Join Date: Dec 2003
Location: richmond va usa
Posts: 1,479
Default

Ram air 5 layout

__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow.
  #8  
Old 09-13-2019, 04:18 PM
Bob with the 66's Avatar
Bob with the 66 Bob with the 66 is offline
Ultimate Warrior
 
Join Date: Jan 2003
Location: Motor city outsider, MI
Posts: 1,124
Default

There are a couple of pro ports out and about. :-)
Attached Thumbnails
Click image for larger version

Name:	Pro port 1.jpg
Views:	155
Size:	44.6 KB
ID:	520062  

__________________
"Artificial intelligence is no match for natural stupidity".

1966 GTO Post Coupe, 467ci. N/A Pump gas, best 1/4 11.6 118mph
1966 GTO Post Coupe, "The Bright Idea" 535ci. N/A Pump gas, best 1/4 9.58 141mph
  #9  
Old 09-13-2019, 04:36 PM
61-63's Avatar
61-63 61-63 is offline
Ultimate Warrior
 
Join Date: Jun 2001
Location: Sour Lake, Texas
Posts: 2,394
Default

I have dealt with old '61-'63 sd heads over the years and on one set of 980s someone had drilled a hole in the water jacket of the dual center exhaust on both sides and tapped them. I have no way of knowing if they had been NASCAR heads or drag race but the only reason they would have done this IMO would have been to install a heater hose pipe in that location on both sides to get the heat out more rapidly. Additionally I've had several sd dual quad intakes with additional threaded holes on the rear flanges both sides which too would have been to screw heater hose pipes in so heat could be more readily removed from the back of the engines/heads. These same tricks could be done on any Pontiac head. How efficient this was I haven't a clue.

  #10  
Old 09-13-2019, 05:05 PM
LiL Jack's Avatar
LiL Jack LiL Jack is offline
Ultimate Warrior
 
Join Date: Sep 2002
Location: Millersville,MD. USA
Posts: 8,522
Default

With a Billet head it doesn’t matter about any coolant mods.

Head gasket issues are a thing of the past.

__________________
First Pontiac powered street car in the 7's

7.940@170.84. 3460#s
  #11  
Old 09-13-2019, 05:09 PM
GTOGEORGE's Avatar
GTOGEORGE GTOGEORGE is offline
Suspended
 
Join Date: Mar 2003
Location: South Rockwood, MICHIGAN
Posts: 8,884
Default

Quote:
Originally Posted by LiL Jack View Post
With a Billet head it doesn’t matter about any coolant mods.

Head gasket issues are a thing of the past.
With a Billet head can you make back to back passes or how does it work?


George

  #12  
Old 09-13-2019, 06:36 PM
grnmnstr's Avatar
grnmnstr grnmnstr is offline
Ultimate Warrior
 
Join Date: Dec 2001
Location: NJ
Posts: 1,337
Default

Quote:
Originally Posted by chiefbigb View Post
Ram air 5 layout
x2.

__________________
1978 Pontiac Grand LeMans.......out next year

Previous - 2001 Jerry Haas-built P/S Grand Am - former WJ car, Hoffman Racing 535" IA2, Tiger Heads/Intake, Single Dominator, PG
Best ET: 7.776 @ 175.94, 1.096 60', 2375 lbs.
  #13  
Old 09-13-2019, 08:22 PM
p4msi1's Avatar
p4msi1 p4msi1 is offline
Chief Ponti-yacker
 
Join Date: May 2005
Location: Louisa, Va
Posts: 503
Send a message via AIM to p4msi1
Default

Quote:
Originally Posted by chiefbigb View Post
Ram air 5 layout
Chief Big B X3

__________________
67 Firebird 3440 lbs, Pump gas 537 IA2, tiger heads, 4.86 rear, 32 x 17.5's, full interior, 4 mufflers, street shape 1.36 60', 6.11@113.42 1/8 mi. 5.67@123 on small shot.
  #14  
Old 09-13-2019, 09:55 PM
67'7F6'Bird's Avatar
67'7F6'Bird 67'7F6'Bird is offline
Ultimate Warrior
 
Join Date: May 2002
Location: MA
Posts: 1,029
Default

DCI RAM AIR V
Attached Thumbnails
Click image for larger version

Name:	Steve Ram Air V Side Shot.jpg
Views:	85
Size:	64.4 KB
ID:	520089  

  #15  
Old 09-13-2019, 10:01 PM
slowbird's Avatar
slowbird slowbird is offline
Ultimate Warrior
 
Join Date: Jan 2001
Location: Montgomery, IL
Posts: 10,638
Default

Quote:
Originally Posted by chiefbigb View Post
Ram air 5 layout
But can the ra5 heads match or exceed the power potential of the other heads?

  #16  
Old 09-13-2019, 10:34 PM
PAUL K's Avatar
PAUL K PAUL K is offline
Ultimate Warrior
 
Join Date: Feb 2004
Location: Sugar Grove IL USA
Posts: 6,282
Default

Quote:
Originally Posted by slowbird View Post
But can the ra5 heads match or exceed the power potential of the other heads?
Before or after the head gaskets blow between the center ports? 😝

__________________
Go fast, see Elvis!
www.facebook.com/PaulKnippensMuscleMotors
  #17  
Old 09-13-2019, 10:41 PM
67'7F6'Bird's Avatar
67'7F6'Bird 67'7F6'Bird is offline
Ultimate Warrior
 
Join Date: May 2002
Location: MA
Posts: 1,029
Default

Quote:
Originally Posted by PAUL K View Post
Before or after the head gaskets blow between the center ports? 😝

HAHAHAHAHHAH

  #18  
Old 09-13-2019, 11:07 PM
Dragncar Dragncar is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Humbolt County California
Posts: 8,283
Default

We all know the RAV does away with that extra heat. High Port, Tiger or E head. Are they all the same or is one better.
I thought that High Ports had better cooling there. Do they ?


Last edited by Dragncar; 09-13-2019 at 11:40 PM.
  #19  
Old 09-13-2019, 11:08 PM
tom s tom s is online now
Ultimate Warrior
 
Join Date: Jan 2000
Location: long beach ca usa
Posts: 18,764
Default

I STILL don't believe a head with a pushrod in the port will out perform NA head without.SHOW me!And I breath and bleed RA V!Tom

  #20  
Old 09-13-2019, 11:21 PM
GTOGEORGE's Avatar
GTOGEORGE GTOGEORGE is offline
Suspended
 
Join Date: Mar 2003
Location: South Rockwood, MICHIGAN
Posts: 8,884
Default

Quote:
Originally Posted by tom s View Post
I STILL don't believe a head with a pushrod in the port will out perform NA head without.SHOW me!And I breath and bleed RA V!Tom
You know whats really funny.........you don't have to believe!


GTO George

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 05:15 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017