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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: Feb 2003 Posts: 1,379 'Bolter | | 'Bolter Joined: Feb 2003 Posts: 1,379 | Ever since I put in the T-5 and the taller gears it seems to be drinking more gas,I put in a stock main jet (drilled the other due to it running lean with the 4.10s) and tinkered with the power valve some but not much if any improvement. Since the newer sixes (70s and early 80s) were designed to run a little slower would it be easier to just put one of them on,I was thinking of a later 250 or 300 Ford carb ands see how it goes. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | I would advise against the ford carb. The ford carbs are actually jetted to run about 150% richer that a GM carb. Best would be to start with a stock rebuild of the original carb. Then you need to find out why it's requiring more feul. Is it seeming to be down on power? Might be a timing issue, possibly needing more advance.
Bill Burmeister
| | | | | Joined: Feb 2003 Posts: 1,379 'Bolter | | 'Bolter Joined: Feb 2003 Posts: 1,379 | It runs fine and seems to have plenty of power,I cant time it normally since I cant see a ball in the flywheel and had run it too advanced for a long time but backed it off some so I will advance it back up a little and see if it helps. I cant set the float level to factory specs due to the carb sitting at too much of a angle,it looks like the motor is supposed to be lower at the rear more then what its at so I found a 54 235 in a junkyard that looks like it has a intake that the carb will set more level. Its a 57 truck motor in a 37 and the intake that came with the motor does not allow the carb to sit level so I dont know if the intake is for a car or a truck but the motor sits mostly level in the 37 and the intake was designed for the motor to sit down a little. I noticed a drop in mileage when I put in the taller gears but I never really paid that much attention to the gas usage before the swap so it could always been not so good. | | | | | Joined: Apr 2005 Posts: 275 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 275 | I've ran YF model Carter carbs on the 235 I used to have & now on my inline 292 Chevy. They use the same jets as AFB models so are readily available. Also have about twice the screws connecting the mid & top sections so's they don't leak gas out like the old Rochesters. Tuning is another story, but given a good distance highway run repeated enough, you can closely document fuel useage. No matter what it came on or how it WAS set up, you can make it right for your application. Putting in an O2 sensor is a good help for tuning too.
Nice looking truck, like your pics.
Doug | | |
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