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| | | | Joined: Sep 2004 Posts: 241 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 241 | I have run both the Carter YF 966s and the Carter YF 2100s on my 1956 235 inline. Is there any difference in these two carburetors with regard to CFM or venturi size? Is the 966s for the 216 and not the 235? Both were good replacements for my old Rochester B. Both Carters were reliable.
Thanks.
| | | | | Joined: Mar 2014 Posts: 4,484 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,484 | The CFM won't be different, but there are internal differences. There is also no difference in the venturi size. Both have a primary venturi of 11/32" and a secondary venturi of 11/16" and a main venturi of 1 5/16". Both used a .81 fuel orifice. For the differences: The 966 used a low speed jet tube of .032 inch and the 2100 used a low speed jet tube of .028 inch. The bypass in body sizes also differ: 966 is .0635" and 2100 is .067". Economizer sizes...number 55 in the 966 and number 54 in the 2100. The metering rods are different. 966 is...economy step .073", middle step tapers to .059" and power step is .050". 2100 is .067", taper to .060" and .050" for power step. Metering rod jet for 966 is .1015" and for 2100 is .0945". Those are the notable differences. Hope it helps.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Sep 2004 Posts: 241 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 241 | Some good information. Thanks Jon. I appreciate it. | | | | | Joined: Aug 2017 Posts: 660 'Bolter | | 'Bolter Joined: Aug 2017 Posts: 660 | I think he put this list out :
Carter YF carburetors produced for use on Chevrolet
756s � 216 engine aftermarket 1937~1952
787s � 216 engine aftermarket 1937~1952
788s � 235 engine aftermarket 1950~1952
789s � 235 engine aftermarket 1950~1952
890s � 235 engine aftermarket manual choke (number assigned, no production)
891s � 235 engine aftermarket auto choke (number assigned, no production)
964s � 216 engine aftermarket manual choke 1937~1952
965s � 216 engine aftermarket auto choke 1937~1952
966s � 235 engine aftermarket auto choke 1950~1952
967s � 235 engine aftermarket manual choke 1950~1952
2008s � 216 engine aftermarket 1937~1952
2046s � 206 engine aftermarket 1932~1936
2100s � 235 engine aftermarket manual choke 1953~1956
2101s � 235 engine aftermarket auto choke 1953~1956
2104s � 261 engine aftermarket (number assigned, no production)
3055s � aftermarket (number assigned, no production)
3211s � 235 engine aftermarket 1957~1962
@@@ I have the 966-S. On my 216 manifold on a 235 engine. Not sure if someone changed the bottom out or not but it runs Great. And it IS Manual Choke.
Last edited by Shaffer's1950; 08/18/2019 10:05 PM.
1950 Chevy 3100
| | | | | Joined: Sep 2004 Posts: 241 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 241 | I had a hard time at first finding a 2100S but found a 966S on Ebay. I've rebuilt both. They are great once you have them set properly. | | | | | Joined: Mar 2014 Posts: 4,484 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,484 | They are and if you want the auto choke model, the 967s is another one you'd like.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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