The Stovebolt Site Forums The Shop Area Engine Shop Converting Carter 967 to ported vacuum

I've acquired a Carter 967 (that needs a rebuild, but looks like a GREAT rebuild candidate), or is it a 966? It has auto choke. I'm wondering if it's feasible to convert to ported vacuum or is that not practical? I'm getting tired of chasing the Rochester 1B. I may still thoroughly go through the 1B this winter (try and straighten air horn, polish accelerator pump well) but I would like something in it's place for now.

Thanks in advance,

Sort of confused by your question, Lindsey. In the YF the distributor vacuum port is right where you're looking (image attached). You may need a brass fitting, but that's where it will be. Just me, but I'd rebuilt the YF nicely and forget about the Rochester. Good luck.

Ok from what I read I thought the 966/967 provides the incorrect vacuum for a '53 and up 235.

Please take a look at the attached two images. These are of a throttle body of the Carter used in the 216. The other image I sent was of a NOS 3211s (for the 1957 and up 235). The size of the port slit is the same. In the first image, the throttle plate sits below the port (horizontal slot). In the second image, I've lifted the throttle plate to show where it might be at idle. So you can appreciate there will be a slight bit of vacuum in the port at idle speed. But for the distributor, it won't matter. The advance diaphragm unit ought to start moving when 4 or 5 inches (mercury) is applied to it, so any vacuum less than that will be seen as no vacuum at all. Personally I'd give it a try and see how it does. I have a feeling it will be fine. It might be that the vac advance diaphragm is different in the earlier 235. I don't know about that, but I think the vacuum provided by the Carter YF should be roughly the same.

Jon, in those pictures, is the throttle body as it would sit on the engine? IE, those slots are above the plate? I don't see the large mounting holes so I'm assuming that's correct. I'll have a good look at my carb this evening.

BTW, I'd like to get this stuff sorted to eventually get to the T5 I have waiting to go in like I see you have.

Cheers,

Yes, Lindsey. I took those images as if the carburetor was sitting on the manifold so you could see the vacuum port slot. Take a look and let me/us know if you have questions. You can also use my email address ([email protected]).

You'll like the T5. It is really a nice change, especially if the ratios in the transmission & rear end are well matched. Good luck with the work.