# on base appear to be 7035733 (in circle)

#s on body 7037576 (in circle)

I cant find a # on the air horn, and have not disassembled it.

there are some other #s stamped in
29268WF 0239
rebuild?

I pulled a bunch of OHC parts out of this garage in the early 90s. Recently I went back and picked up the rest. The owner (friend's father) had a 69 4bbl 4spd OHC Lemans back in the 80s, but I dont think it's an OHC carb. The center # i think might match to a 69 RA car, but the base doesnt seem to.

I dont see an identity plate, but there are a few other things cast and stamped in. It has a cork gasket between base and center, and some type of metallic/composite(?) filter instead of paper.

any help appreciated.

You have a "marriage".

Jon.

How about #7029244? I was told it was originally ordered for a cadillac. Don't know what year.

Robert

Buick

Identification of virtually any original equipment carburetor (up through the 1974 model year) if fairly easy, assuming you have the carburetor identification number. To do so:

(A) bring up your favorite search engine (we use google)
(B) type the following string:

"Carburetor Shop" bbbbbb nnnnnn
where bbbbbb is the brand and nnnnnn is the number
in this case the string would be

"Carburetor Shop" Rochester 7029244

This will bring you to an applications page on our website.

From there (assuming you are using Internet Explorer) click the "Edit" pull-down menu, and "Find on this page" and enter the carburetor number. This will take you to the exact listing.

In the case of the first example, one must add the 70 to the 29268 resulting in 7029268. The string for this number would be:

"Carburetor Shop" Rochester 7029268

It is well documented in many places on the internet where some of the 1969 Rochesters were stamped without the 70.

In this instance, the additional information of casting numbers proves that the castings have been interchanged from different carburetors (this information is not on line).

Jon.

http://home.earthlink.net/~glennrz/QJ_NUMBER_STYLES.htm

scroll to the bottom and you will find some casting number information to go along with Jon's.

thank you. i guess it was supposed to be a 7029268 and someone swapped the base for whatever reason... wonder why.
oh well, i knew it wouldn't be for the OHC, but it might still be a decent carb for something once rebuilt

Thanks Jon. That makes it very user friendly. Now I can run the numbers on all four spares and the pair of 450 Holley's too.

Robert

Jon, I have a service replacement carb (17054905)
on my otherwise #'s matching car...My question is: This SR carb is listed for ALL v8's in '68 and 69.
How were these carbs calibrated for all applications? Did they use the same part number but a different code for the different applications?
Finally, would you have the specs. on this carb?

Thanks, Mike

68_Fbird - I do not KNOW the answer, but will attempt a "swag"!

Generally speaking (and probably true for this unit), a factory service replacement would have sufficient idle fuel for the largest demand, and would then be a little "fat" on the others. The idle system for a family of engines can normally be adjusted with the idle mixture screws. The main metering circuit, likewise, would be calibrated for the maximum demand. The carburetor would then function (with less fuel economy) on the other engines.

This same theory is true for difference in carburetors designed for engines with automatic or manual transmissions. The carbs designed for the automatic will be from 1/2 to 2/3 size richer in all vacuum ranges than the carb for the manual transmission. Thus, one can normally use a carb for an automatic on a manual car with slightly less fuel economy; but trying to use a carb designed for a manual car on an automatic will result in lean issues.

I would NOT want to use this particular unit with a ram air camshaft.

We have specs up to and including the 1974 model year. I believe this carb was released in 1977. We have no specs on it.

Jon.

Jon, thanks for the info, I suspected that if it was a 'One size fits all' it would be set-up to handle the largest fuel requirement amongst the engines.
The car runs great and I will probably leave it alone unless I run across the correct carb.

Mike - which carb do you need?

Jon.

another question...

is the secondary upper plate supposed to have these notches cut out? I have 2 other quadrajets that do not have them. if they are supposed to be there, what is their purpose?

Yes, those are original. They work like secondary accelerator pumps by allowing some air in as the throttle valves open and pulling fuel from the accelerating well ports before the air valve opens. That's an early QJ. They changed them later.

does the sprint QJ have them as well?

My '66 does not, but it is a more primitive style of QJ, with an air valve dashpot.