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Click on image for the lowdown. 
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| | | Forums66 Topics128,052 Posts1,055,773 Members48,426 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Nov 2012 Posts: 12 New Guy | | New Guy Joined: Nov 2012 Posts: 12 | I have a 66 3/4 ton 2wd with a SM420. Can anybody tell me what all I will have to do for this to work? The V6 runs but I am tired of gettin 5 mpg running down the highway and I dont want to end up trying to find parts if it breaks down sometime in the future. | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | You'll need a Chevy bellhousing from a similar year(63-67IIRC), plus some engine frame mounts for the same. With the Chevy small block you should jump up to 9-10mpg. | | |
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