#1  
Old 11-03-2021, 02:37 PM
AJ- AJ- is offline
Junior Member
 
Join Date: Apr 2020
Posts: 25
Default mounts and headers

Considering doing a pontiac swap into a gbody. I have a 350 and a bunch of spare parts laying around and a roller so I'm getting ideas.

A couple of questions:

Can anyone confirm if hedman 3-tube headers fit in gbodies?

How crucial are the gbody 301 motor-side mounts to make this work? I have some motor-side mounts from an fbody but I hear they make the motor sit too high. How high are we talking here? I feel like 301 mounts might be pretty hard to find.

  #2  
Old 11-04-2021, 12:11 PM
Ken MacNicol's Avatar
Ken MacNicol Ken MacNicol is offline
Senior Chief
 
Join Date: Feb 2001
Location: Hendersonville, Tenn. ,USA
Posts: 496
Default

The early 70,s Firebird mounts (rubber on block, solid on frame) work just fine, and if I remember the 3 tube fit also

  #3  
Old 11-04-2021, 01:13 PM
Hammertime Mike's Avatar
Hammertime Mike Hammertime Mike is offline
Chief Ponti-yacker
 
Join Date: Dec 2008
Location: Tennessee
Posts: 950
Send a message via ICQ to Hammertime Mike
Default

Quote:
Originally Posted by Ken MacNicol View Post
The early 70,s Firebird mounts (rubber on block, solid on frame) work just fine, and if I remember the 3 tube fit also
X2 on the motor mounts, I used Mad Dog 2" headers.

__________________
  #4  
Old 11-04-2021, 02:01 PM
unruhjonny's Avatar
unruhjonny unruhjonny is offline
Ultimate Warrior
 
Join Date: May 2004
Location: Calgary, AB, Canada
Posts: 5,295
Default

I cannot attest to which headers work, but in the late 1990's a friend bought a stupid mint 1978 Grand Prix (it his cousin's neighbors, and I'd often drool at it in years prior).
It was a pretty loaded 301-4bbl car, and when the head gasket needed replacing (if my memory serves me) he opted to build a 1971-400 for it;
I believe that he needed nothing fancy to make it work - I believe the same mounts were used.
I cannot recall if he went with headers, but my gut says he used F-body exhaust manifolds.

__________________
1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
1 Corinthians 2:12-14 / Ephesians 2: 8-9 / Luke 23: 39-43 / 2 Timothy 3:1-5;12
  #5  
Old 11-04-2021, 02:35 PM
AJ- AJ- is offline
Junior Member
 
Join Date: Apr 2020
Posts: 25
Default

Thank-you for the replies! I do have rear exit manifolds in addition to the 3-tube headers so I guess worse case scenario I could use those. Headers would be better on a couple of fronts.

The motor mounts I have are late '70's firebird/trans am. So the rubber part will be on the frame. They look real similar to the 301 ones. The car is currently set up for sbc. I have the pontiac motor, the correct alt/ps pump and brackets, a BOP tranny, and I'm not too worried about figuring out the wiring/fuel line. I guess the mounts are the x-factor. Hopefully with a stock intake and a drop base air cleaner it will fit okay.

  #6  
Old 11-04-2021, 02:38 PM
AJ- AJ- is offline
Junior Member
 
Join Date: Apr 2020
Posts: 25
Default

Looking at some pics of the early 70's mounts -- I USED to have a pair, but I believe I chucked them. Ill have to look again. One of those things you hang onto for years and then finally get rid of them only to realize you should have kept them.

Are those mounts going to work better than the late 70's ones I have?

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 07:02 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.

 

Cold Case Radiators

Cold Case Radiators is a Max Performance company that produces high end aluminum performance radiators at a price point that won't break the bank. Polished and stamped tanks. 2 rows of 1" tubes. Lifetime Warranty.

GTOG8TA.com

GTOG8TA.com is a Max Performance company that manufacturers parts for the 04-06 GTO, 08-09 G8, and 93-02 Firebird/Trans Am platforms.

Copyright © 2017