[Charlie Brengun]

Thanks for that tip, should be an interesting read. you can find the document here: https://secure.poci.org/Docs/291.PDF

And just in case someone is interested.. these might be from someone on the board here or not (they aren't mine) but https://www.ebay.com/itm/AFB-Dual-Qu...e/193775590100

[carbking]

Absolutely great article!

Adding a bit of history:

Carter 3433s and 3435s were released on 13 November 1961 and discontinued 29 January 1968.

The drawings were for "low production tooling". Basically, when an order was received, the folks at Carter would pull a pair of Carter 3012s (Chevrolet) carbs from the shelf, grind off the "3012s", and build using the Pontiac throttle shafts, and internal Pontiac calibrations.

For identification, the air horns were marked with an India ink stamp, and tags were placed on the air horn to body screw along the back of the carburetors on the pump side (I use Carter designations of pump side and choke side, rather than driver's side/passenger side; remember driver's side depends on where you drive .

As the Chevrolet 3012s underwent a number of changes over the years, casting numbers on the bodies will depend on exactly when the 3433s and 3435s were ordered and built. Somewhere, I have the list of casting numbers used, but don't remember where it is, and don't want to look for it. Memory (not as good as it once was) says 4 different body castings were used over the range of production.

The Chevrolet 3012s was the only donor that Carter used, but many folks use the Buicks today, as John mentioned, because of costs.

During the production run, 33 changes were made to these carburetors for various reasons. Those that are totally anal about appearance will have a difficult time because the shape of plugs, the design of the "S" link, and other external changes were made.

For those looking for specification pages in the big Carter master parts books, good luck! As these were low production carburetors, Carter did not print the normal specification pages for these carburetors.

For low production units, Carter issued (T)emporary (F)ield (N)otices, referred to as TFN's, on a need-to-know basis only. Should one have access to the Carter TFN's, the original TFN covering these units was TFN-622. TFN-622 was superseded by TFN-686, TFN-694, TFN-696 and TFN-696A which was the final release. The later releases, in addition to the 3433s and 3435s, also cover the later SD carbs.

Jon.