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I-6 Engines For GMCs that came with the Inline 6 Engines

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  #1  
Old May 28th, 2014, 09:40 AM
66birdman 66birdman is offline
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Default Swapping in an I6?

I have a 66 C15 with a 351E and a SM420 in it and I was just given a freshly rebuilt 250I6 out of a 74 Nova. Any ideas on what would be required to swap it in there? Motor mounts, cross member and a bellhousing I assume. Anything else I am not thinking of? I really dont want to ditch the 351 but parts are hard to come by and stupid expensive.
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  #2  
Old May 29th, 2014, 05:30 PM
BarryGMC BarryGMC is offline
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Default Re: Swapping in an I6?

Motor stands bell housing convert the throttle to cable type. But why? Is the 351 dead or dying? If it is its not hard to find a good 305-351 v6. Barry
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Old May 29th, 2014, 05:40 PM
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quest quest is offline
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Default Re: Swapping in an I6?

Quote:
Originally Posted by BarryGMC View Post
Motor stands bell housing convert the throttle to cable type. But why? Is the 351 dead or dying? If it is its not hard to find a good 305-351 v6. Barry
Ditto, whats wrong with your 351? sure would be a nice motor to keep in the truck. I wish mine had that one!
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Old May 30th, 2014, 03:05 AM
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GMCDAC GMCDAC is online now
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Default Re: Swapping in an I6?

Quote:
Originally Posted by 66birdman View Post
I have a 66 C15 with a 351E and a SM420 in it and I was just given a freshly rebuilt 250I6 out of a 74 Nova. Any ideas on what would be required to swap it in there? Motor mounts, cross member and a bellhousing I assume. Anything else I am not thinking of? I really dont want to ditch the 351 but parts are hard to come by and stupid expensive.
If you have to do this swap I can take pictures of frame towers and engine mounts and a 250 with the bell housing. Also have some other pieces like mechanical clutch linkage and brackets I can take pictures of also. These parts came from a '64 Chevy pickup.

DAC
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Old May 30th, 2014, 03:15 AM
bigblockv6 bigblockv6 is online now
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Default Re: Swapping in an I6?

You're losing 100 cubic inches as well as the novelty of a GMC V6 powered truck. If there's anything wrong with your 351E spend the money and have it rebuilt. True parts are harder to find now than ever but give it some time or find another V6 that's lower mileage or been rebuilt, even consider a 401 that pistons are being reproduced for.
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  #6  
Old May 30th, 2014, 03:43 PM
66birdman 66birdman is offline
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Default Re: Swapping in an I6?

The engine runs fine as of now. Compression tested at 115-125psi all the way around and a blow down test showed anywhere from 10-15% which is well within the acceptable range. I am just getting my ducks in a row for when something breaks that I cant find parts for is all. Unfortunately my "fixing the V6" fund was diverted to my cruiser restoration. Come to find out thunderbirds are insanely expensive to buy things for.
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Old May 30th, 2014, 11:21 PM
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Default Re: Swapping in an I6?

Your V-6 should outlive well ---- me anyway,-LOL! Don't know your age! Those numbers are good to go with no worries I would think. Get the T-Bird done and drive the heck out of your GMC too.

DAC
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1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday
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Old May 31st, 2014, 05:18 AM
66birdman 66birdman is offline
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Default Re: Swapping in an I6?

The only problem is massive oil leaks at the moment. The Tbird just got all new suspension, fresh rebuild on the 390, floor pans and now I am reupohlstering the seats. That all came to about 6 grand this month just in parts. I love my GMC but the bird is my baby. I use the truck as a truck and just keep it running for the most part.
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  #9  
Old January 29th, 2017, 10:41 PM
bluestreak1854 bluestreak1854 is offline
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Default Re: Swapping in an I6?

I have a 478M with an Allison auto transmission that only has 8696 miles on it with everything needed to install it. I also have a manual 5 speed and 4 speed brownlite if your interested.
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