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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: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | The Jet on a 261 carb is about .010 bigger than the ones on a 235. Also the internal passage between the power ball and the jet is bigger. If you don't end up with a way too rich condition, you will be very lucky. More air yes, more fuel YES.
If its a valued truck and you drive it a lot, get a 235 carb and then sell the 261 carb. They are worth a lot because they are very rare. I just went through this very thing. I had a 261 carb on my 235 test engine and didnt know it. I could not figure out why I had soot everywhere! If you can adjust it where the plugs are gray, you are doing better than me. | | |
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