Quadrajet Problem Solving > Quadrajet Parts and Numbers

Do I have a 73 SD q-jet?

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stevef:
I forgot about this q-jet that was sitting on a shelf in my parts room for years. Finally I noticed it sitting there today and with Cliff's book, I translated the number, 7043262. So, it's a 73 Pontiac, Federal, automatic trans application. Julian date, 2312, translating to Aug. 19, 1972.

It looks just like the photo showing the bracket for the choke pull-off on page 11 of Cliff's book, that was described as a 73 SD carb. So, have I lucked out and have a 73 SD carb? Any other clues needed to make sure?

Looking at the carb from the front, to the right of the fuel inlet, there are 2 small empty holes in the front of the body, that I thought were maybe holes where the vac tubes had pulled out and were missing. But, I see in Cliff's page 11 photo that it has the same 2 small holes being empty as well. What are those holes used for and should they be plugged or are they used for vacuum sources, and if so how can they be without tubes stuck in them? Thanks!

Cliff Ruggles:
Unfortunately, it's just the standard Pontiac V-8 auto trans carburetor for that year.  The Super Duty part numbers were 7043270, and 7042373.  They also made Service Replacement SD carburetors, part numbers 17054910, and 17054911 (going by memory here, but I'm pretty sure those are the numbers.)

The 1973 and 1974 Pontiac Super Duty carburetors were the first "800" cfm castings that used the outer booster rings.  They made a brief run of "800" cfm carburetors in 1971 for the HO engines that were special castings that didn't use the outer booster rings.

Far as I know, the 73 and 74 Super Duty carburetors were also the only early design hot air choke large cfm castings.  They are pretty rare carburetors, and pretty valuable as well......Cliff

stevef:
Oh well, that's okay. It's good to know what it is. Thanks Cliff.

Any idea about what the 2 empty small holes on the front right side of the main body that look like vacuum source holes are for and how they are used?

Cliff Ruggles:
I'd have to go to the shop and look at one.  Some do have a ported vacuum source there, but they also had bosses to bolt down a fast idle solenoid bracket, at least from what I can remember about them?.....Cliff

stevef:
I think you're right about the holes being for mounting a fast idle bracket. The holes are threaded. Here's a pic. Thanks alot for your help:

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