This was designed by Carter for the Chevy 230 and was also used on the 194. Originally I bought 3 of these to study them. Particularly I was interested in whether this could be used on the 235 (since it is a manual choke model and also since it is a newer design like the YF 3211S which recognizes changes GM made to the 235 in the last years of production). This one has been cleaned well and rebuilt. The choke appliance for it was missing, so I made a crude one which probably will work fine. Why no throttle appliance? Carburetors for the 230, 194, 250, etc never had a manual throttle (at least in regular production--the 230 was and still is used in irrigation applications). Two reasons why...one-throttles had lost popularity by then. Two...the throttle linkage works opposite from the 235 (or 216, 261). In the 235 the throttle lever is pushed upward to increase speed, so the throttle appliance can be combined with the choke. In the 230, etc, the throttle lever is pulled downward and the rod hole is located on the other side of the pivot point. GM also made the throttle rod hole smaller so people wouldn't be trying to use older carburetors on the 230 (since older ones won't work with the new design of linkage). However...there's always a "however"...you can make a simple throttle lever extension, drill a 1/4" hole in it and then you can use this carburetor on the 235. There's even a hole in the lever you can use for this purpose.
The differences in this YF model? It is the newer design and incorporates both an internal fuel filter and a variable bowl vent. I tried one of them (it will also be offered for sale here) on the 235 and it did fine although in honesty it seemed to run slightly on the rich side for the 235. But it started well, idled well and otherwise seemed ok. So my thoughts? You could use this on a 194 or 230 "as is" or you could modify slightly and use on the 235, possibly playing with smaller sized jets if you wish. The 230 was after all a bit different design than the 235 and it breathed differently. But for this one, $100 plus shipping.
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One other comment...while studying this carburetor, I wondered if the sintered bronze fuel filter was still made. The answer is yes...they are and they're very reasonably priced and available from Fleet Filter:
I received an email asking if I'd modify this for use on the 235. The answer is "yes, I'd be happy to." In fact, I may do that later today. The modification won't have any effect on it if you wanted to use on a 194, 230, or other similar inline six but will make it more versatile.
I ran across some interesting data on this carburetor yesterday and thought I'd share it. The specifics are almost the same as the Carter YF966S and YF967S. The main metering jet is exactly the same size and so are all 3 steps on the metering rod, so this carburetor is going to perform on the 235 about like the 966S or 967S. The YF966S and YF967S were as you may recall specifically engineered for the 235. I said "almost the same"...what's different? The idle jet is smaller in this one. In the 966 and 967, the jet was .032" in diameter. In this one it is .027" in diameter. So at idle or while in the low speed range, it will run leaner. And I believe that is an interesting sign of the times. When this carburetor was designed, auto makers were trying hard to help lower smog and pollution arising from bumper-to-bumper traffic and a leaner idle was seen as one solution to that problem. Aside from that the difference is the air cleaner hold-down is performed with the central screw/nut allowing for the use of a more modern air filter unit.