Should someone wish to consider the small (400 CFM) Carter AFB, there were two of the 9000 series aftermarket version.
(1) 9400s was released about 1972.
(2) 9410s superseded 9400s about 1975.
The difference in the two carbs is that 9400s came with no EGR port. The casting was machined for an EGR port (it may be plugged), and the new number 9410s was supplied.
Both have GM linkage, and 12-volt electric chokes.
For those that wish to modify these carburetors, Carter produced a "strip-kit". The strip-kits contained a selection of different orifice fuel valves, different orifice jets, and different diameter metering rods. The original strip-kit was 10-101. There 16 different strip-kits in the original "100" series. Due to dealers griping about the number of different kits, Carter consolidated parts into only three kits, the "200" series , one for AFB's, one for AVS's, and one for TQ's. The new number for the consolidated AFB kit is 10-201. While all parts in the 10-201 will fit either the 9400s or the 9410s, the calibration of the parts in the original 10-101 kit are more useful for the 9400s and 9410s.
In addition to the strip-kits, Carter also produced "blister-pack" sets of vacuum piston springs. There were two different (and please forgive me, I do not remember the numbers); one contained 2 each of 3 different value springs, the other 2 each of 5 different value springs. The numbers started with 61P something. 61 was the Carter code for spring, and the P meant performance. There was also a blister-pack of pump squirters, part number starting with 48P something.
I HIGHLY recommend that if one is going to use modify one of these Carter carburetors, that genuine Carter parts SHOULD be used; not the modern imitations. When the imitations first came out, I bought several hundred step-up rods, only to find the quality control was less than horrible! They ended up in scrap brass! Rods that were marked "64" when checked with a micrometer could be anywhere from 60~68 thousandths.
EDIT: just read Jerry's last post. Jerry - on my personal 300 CID Ford engine, the Offy intake and the Carter 9400 added a significant amount of torque, and almost DOUBLED the fuel economy of the original Holley single barrel that was used by Ford. Again, apples and oranges.
Jon.
