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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: Jul 2014 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2014 Posts: 48 | So, my 1 3/4" carb actually measures 1 11/16" at the throttle plate. After sourcing a local (rebuildable) replacement, it measures the same. I guess all this stuff about a 1 3/4" throttle plate on the 261 is nonsense??? Its bigger than a 235, but not THAT big.
Or is there another carb that I should be looking for??? | | | | | Joined: Feb 2004 Posts: 29,844 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,844 | I think you're misreading the specifications. Isn't it the VENTURI- - - -not the throttle plate, that's supposed to measure 1 3/4 inches?
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2014 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2014 Posts: 48 | Normally a venturi will start large, shrink in size, then taper back out to a larger throttle plate. Larger. To install a smaller throttle plate would be detrimental by design. It won't draw fuel properly. Call it an assumption on my part, but it was quite a surprise to see the small throttle plate. Obviously it was intended to idle well and drivability doesn't really matter. | | |
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