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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old January 19th, 2021, 08:18 PM
atomman atomman is offline
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Default V-12 2bbl carbs

What is on the market today that could be used.? Not using the originals that were governed.
atomman
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  #2  
Old January 25th, 2021, 01:33 AM
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Rap'em Pappy Rap'em Pappy is offline
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Default Re: V-12 2bbl carbs

Atomman, I use the Holley 500 0-4412s like most use on the v6. I use with
the 1937M Mr Gasket adapters. The pair have been working great for about
15,000 miles. I have the stock carbs on the L7000, that have also worked good. If I can Help let me know.
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  #3  
Old January 26th, 2021, 01:48 PM
atomman atomman is offline
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Default Re: V-12 2bbl carbs

Thanks for the pix. I will use those carbs. What have you done for motor mounts. Since Bob Walker, Thunder 12, is no longer selling to the public, the only trans adapt I can find is made from aluminum and it has no bosses for motor amounts to bolt to.
Dan Marx
dlmarx@bellsouth.net
803-549-2187
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  #4  
Old January 27th, 2021, 07:12 PM
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Rap'em Pappy Rap'em Pappy is offline
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Default Re: V-12 2bbl carbs

Bob Bendtsen's adapter company was sold to Speed Gems now,1-763-767-4480. Bob made my adapter. Speed Gems has great machine shop with a good group of men. My first pic is looking a the alum adapter by oil filter. I have a 4" beam under the adapter to inside c frame. The next pic I would use a urethane mount on the next engine. I did double frame the frame for support. The other V12 guys would have better ideas I think. I also had to make a cover for the transmission. The beam just fits. I did use a urethane transmission mount in front. This is just my 2 cents.
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  #5  
Old January 27th, 2021, 09:23 PM
atomman atomman is offline
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Default Re: V-12 2bbl carbs

As I see the pix, the trans adapt is setting on the beam. How did you attach the beam to the aluminum adaptor?
Dan
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  #6  
Old January 27th, 2021, 09:26 PM
atomman atomman is offline
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Default Re: V-12 2bbl carbs

OK, I see where you put two bolts into the bottom of the adaptor.
Thanks for the pix.
Dan
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  #7  
Old January 28th, 2021, 07:53 PM
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Rap'em Pappy Rap'em Pappy is offline
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Default Re: V-12 2bbl carbs

I would ask speed gems to drill and tap say 3/8 bolt holes on bottom and sides
of adapter plate. Maybe machine a L bracket mount on sides of adapter as part of it. I talked to them a couple of years ago about that. They said they could
machine anything. They are only about ten miles from me.
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  #8  
Old September 4th, 2022, 01:06 PM
MKERoadWarrior MKERoadWarrior is offline
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Smile Re: V-12 2bbl carbs

Saw an article by Street Muscle Magazine from 2015 with some video clips of a GMC pickup with the 702 V-12 (link is below) and I assume that is yours? It looks incredible and I would love to see (and hear) it sometime. I live on the west side of Madison so if you're still in Sun Prairie it would be great to meet up sometime before the weather turns. Cheers!

https://www.streetmusclemag.com/news...-a-wii-bomber/

Quote:
Originally Posted by Rap'em Pappy View Post
Atomman, I use the Holley 500 0-4412s like most use on the v6. I use with
the 1937M Mr Gasket adapters. The pair have been working great for about
15,000 miles. I have the stock carbs on the L7000, that have also worked good. If I can Help let me know.
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  #9  
Old September 5th, 2022, 05:00 PM
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Rap'em Pappy Rap'em Pappy is offline
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Smile Re: V-12 2bbl carbs

MKERoadWarrior
I left a voice message on your phone. That clip was at the
Milwaukee fair grounds. I will be at a little cruse-in Tuesday night 9-6-22.
Leipsic, Wi, a dot on the map. That old V12 will be there for you. Otherwise, Stop at my house an we will talk GMC's
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