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Mod | | | Forums66 Topics128,050 Posts1,055,641 Members48,426 | | Most Online14,466
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 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | I added a section on carburetion to the How-To Article here: http://devestechnet.com/Home/TheVenerable261Special thanks to Pre68Dave for the new pictures and the knowledge! It's amazing what we can do with our knowledge when we work together! This is great information for you 261 owners out there. | | | | | Joined: Sep 2006 Posts: 2,393 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 2,393 | I likely have run 235 carbs on my 261 without ever knowing this info. So thanks! So did the larger throttle body fit a corresponding larger opening in the intake manifold as far as the mount is concerned?
Drew
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Mounting and manifolds are the same 235-261.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | I didn't want to answer without checking first, but the manifolds we use have a 1.800 inch opening for both 235 and 261 (obviously since they are the same) so no worries on choking the flow with the manifold.
HOWEVER, the plastic carb riser that you get from the vendors is tapered and is 1.715 at the top and 1.690 at the bottom. Since the 235 gasket is 1.685, you are good to go on the 235 but the gasket that has the 4 slots is 1.780. So, my 261's use the 4 slot gasket so I am good there, but wonder if our black carb riser is a choking point on the 261? If so, any recommendations on how to make that hole bigger without ruining it?
Last edited by Deve; 07/22/2015 10:12 PM. Reason: last sentence
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