#1  
Old 09-12-2021, 09:00 PM
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ponchjoe ponchjoe is offline
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Default Pontiac Swap in a 62 GMC

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
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  #2  
Old 09-13-2021, 11:55 AM
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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.

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Jeff R
78 Catlina Safari, Soon to be Pontiac 400 powered
78 Sunbird Safari, Buick 231 V6 2004R
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
09 Solstice Coupe, 2.4 Ecotech 5-speed manual
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack
  #3  
Old 09-13-2021, 12:45 PM
694.1 694.1 is offline
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I like your plan.

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  #4  
Old 09-13-2021, 01:19 PM
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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.

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Jeff R
78 Catlina Safari, Soon to be Pontiac 400 powered
78 Sunbird Safari, Buick 231 V6 2004R
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
09 Solstice Coupe, 2.4 Ecotech 5-speed manual
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack
  #5  
Old 09-13-2021, 04:17 PM
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ponchjoe ponchjoe is offline
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Thanks for the insight Jeff. I appreciate it. I had read the headers could be fun but think Ill go with Ram Air manifolds.
Thanks again!

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  #6  
Old 10-06-2021, 04:41 PM
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buds56 buds56 is offline
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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.



I used exhaust manifolds that exit in the rear



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



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



Good Luck

  #7  
Old 10-15-2021, 10:19 AM
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ponchjoe ponchjoe is offline
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Thanks for posting that info, it helps a lot and I love your truck man!

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Old 10-15-2021, 09:19 PM
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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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Jeff R
78 Catlina Safari, Soon to be Pontiac 400 powered
78 Sunbird Safari, Buick 231 V6 2004R
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
09 Solstice Coupe, 2.4 Ecotech 5-speed manual
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack
  #9  
Old 10-16-2021, 05:43 PM
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ponchjoe ponchjoe is offline
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Id be very interested in that Jeff. Thanks man
Zip code is 46124, let me know
Joe


Quote:
Originally Posted by camerjeff View Post
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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