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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Running a 59 Pontiac 389 which has been bored and stroked to 447 in my 59 gmc 1/2 ton longbed. Engine was a mild build. I have 3.70:1 gears and a 27% OD transmission. Gas mileage is still about 14 mpg at freeway speeds. I get about 10-12 MPG when I hotrod around and open up the other 2 deuces.
When I first put the OD transmission in, it was behind the 336 gmc engine. Mileage was not improved. I got 10-12 MPG with the factory 4 speed, and the same with the OD. The mileage did improve with the freshly rebuilt 447. I suspect my mileage woes with the 336 were due to a worn out Stromberg ww carb. | | |
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