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-   -   Pontiac Swap in a 62 GMC (https://forums.maxperformanceinc.com/forums/showthread.php?t=853214)

ponchjoe 09-12-2021 09:00 PM

Pontiac Swap in a 62 GMC
 
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Hey guys, not sure where to put this but I will be putting either a 389 or 400 in my 62 GMC Pu. It is sitting on an 86 c10 chassis and I am looking for others that have done this.
Any insight into issues and what parts were used like motor mounts and exhaust would be appreciated.
Thanks

camerjeff 09-13-2021 11:55 AM

I know of 2 people that put 455's in Mid to late 80's Suburbans so it can be done. I will ask them what issues they ran into.

694.1 09-13-2021 12:45 PM

I like your plan.

camerjeff 09-13-2021 01:19 PM

I was Told the only issue were normal, trans adapter plate to retain the original Chevy bolt pattern transmission, and adapt the battery and wiring due to the starter being on the other side. Other than that he said he used the late 70's Pontiac style Captured motor mounts and just drilled the needed holes in the X-member. The only other issue he could remember was getting shorter A/C lines as the A/C compressor is now on the passenger side if you use Pontiac Belts & Pulleys. Also the Coolant hoses & connectors were a bit of a challenge.

He said he originally did the conversion on a 84 1 ton dually, then when he scrapped the truck he liked the torque of the 455 so much he put it in the 69 Suburban that I remember. I forgot it was a 69.

ponchjoe 09-13-2021 04:17 PM

Thanks for the insight Jeff. I appreciate it. I had read the headers could be fun but think I’ll go with Ram Air manifolds.
Thanks again!

buds56 10-06-2021 04:41 PM

I put a 400 in my 67 GMC with a 400 Turbo
Started as a low budget 60k mi. engine and a quick fun project

Used the frame mounts from a 73 -87 chevy truck with the clamshells and the engine mounts from a 75 Catalina.

https://i.postimg.cc/Rh85svN1/IMG-20...-111320387.jpg

I used exhaust manifolds that exit in the rear

https://i.postimg.cc/3xkCQYW4/IMG-20...52938189-2.jpg

This is how it sits now, I had to pull it back out and rebuild the engine because it smoked ,flat cam etc.

https://i.postimg.cc/yx0tP0CK/IMG-20...70714873-2.jpg

Just got it tagged and insured, waiting for the seat to come back from the upholstery shop

https://i.postimg.cc/V60kzZnF/67-GMC-2021-8-20-2.jpg

Good Luck

ponchjoe 10-15-2021 10:19 AM

Thanks for posting that info, it helps a lot and I love your truck man!

camerjeff 10-15-2021 09:19 PM

That is a nice looking Truck!

Joe if you want to use the 75-76 full size motor brackets, I have a spare set you can have for postage.

ponchjoe 10-16-2021 05:43 PM

I’d be very interested in that Jeff. Thanks man
Zip code is 46124, let me know
Joe


Quote:

Originally Posted by camerjeff (Post 6287473)
That is a nice looking Truck!

Joe if you want to use the 75-76 full size motor brackets, I have a spare set you can have for postage.



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