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-   -   mounts and headers (https://forums.maxperformanceinc.com/forums/showthread.php?t=854394)

AJ- 11-03-2021 02:37 PM

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.

Ken MacNicol 11-04-2021 12:11 PM

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

Hammertime Mike 11-04-2021 01:13 PM

Quote:

Originally Posted by Ken MacNicol (Post 6292483)
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.

unruhjonny 11-04-2021 02:01 PM

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.

AJ- 11-04-2021 02:35 PM

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.

AJ- 11-04-2021 02:38 PM

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?

tininjun68 01-06-2022 09:06 PM

How goes it??
 
Hey AJ,
Make any progress on this build? I rarely stop in G Body forums but I did and started reading up cause it caught my interest. My first dependable daily was a ‘78 GP. Had a 70/71 400/BOP350/10bolt, 8.5” posi. This was 1996 when I bought it so it was very clean. Looked great with the landau roof (made the side window proportioned well IMO) Best driving Pontiac I had for a while! Best of luck with your build and post some photos when you can!


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