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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!
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| | | | Joined: Jul 2009 Posts: 6 New Guy | | New Guy Joined: Jul 2009 Posts: 6 | I wanted to know what i need to change my gmc 270 striaght six to a smallblock chevy and to keep the original 4speed tranie
thanks for all your help
yo
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy bigbryan, could you please remember to tell us what year and size of truck you are asking questions about. | | | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Actually Brian the first step is to ship that 270 to me. I don't really care what year it is...
And welcome to the Stovebolt!
I see you registered way back in July and this is your first post. Glad you decided to jump in and join the conversation.
Tell us more about your truck and we'll be able to help you more.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | | | | Joined: Jul 2009 Posts: 6 New Guy | | New Guy Joined: Jul 2009 Posts: 6 | o sorry it a 59 gmc 1/2 ton and the only reason im replacing the engine cause it started knoking on me and im keeping the engine to rebuild eventually unless some one will give a crap load of money for it
yo
| | | | | Joined: Apr 2005 Posts: 2,101 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,101 | You will need a V-8 truck bellhousing from a 55-59 or 63-67 V-8 or 6 cyl will also work. This is a common swap but nothing from the original 6 cyl will work on the V-8. I have done several of them using the original trans. If you send me an email at [email protected] I can send you a spreadsheet listing the parts you need for the swap. Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: May 2007 Posts: 3 New Guy | | New Guy Joined: May 2007 Posts: 3 | Fred,
That is great info. I have a '59 GMC 3/4 ton with a 270 I6. The motor is shot. I would like to replace it with a late model, ('72) 250 I6 or a generic 350 but keep the stock trans. Is your offer still open on a list of parts needed?
Many thanks,
Steve H
Steven G Hart
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