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Jul 21st, 2025 | | | | Joined: Sep 2009 Posts: 296 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 296 | I will be working on my truck this next week, and have a fresh rebuilt Zenith 228 (model 11963) ready to install. My question is what do I need to look for or adjust on the zenith carburetor once I have it installed. I’m having a little bit of trouble finding how to tune this carburetor for my stock configured 261 engine. I do not have the carburetor with me at the moment, but I am not certain that it has the adjustable jet either. Any guidance?
-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red
| | | | | Joined: Jan 2017 Posts: 61 'Bolter | | 'Bolter Joined: Jan 2017 Posts: 61 | Also curious as i'm in the process of sorting out carburetion on my 261. | | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | The G.M.C. used Zenith type 228 sizes 11 and 12. The 11963 is a size 11. I would have used a size 12 for the 261.
Would suggest waiting until you get the carburetor to see if it has the adjustable main metering jet.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Sep 2009 Posts: 296 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 296 | Is that an easy swap to a 12 if not adjustable?
-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red
| | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Both the size 11 and size 12 have the same 2 15/16 mounting patterns. The differences are internal.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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