Hi m,
I agree with your decoding of the the date stamp.
Perhaps the '0' in front of the carb part number indicates that the carburetor is a service replacement?
The placement of the part number and date code, and the lack of the 2 letters that indicate the plant at which the carburetor was assembled, indicate that too.
Regards,
Alan

 

 

Hi, 7029207 is used for a 1969 350 manual Transmission Corvette and GMC and Chevy Trucks. Allen is most likely correct it is a replacement but could be a truck carb made the 31st day of 1975. They continued making them for trucks until 1979. Either way it will work just fine for a Corvette. Info below From Carbs unlimited: The Muscle car info link refers to 1969 Corvette manual Trans application. Tim"This carburetor was made by Rochester , The Rochester Products Division of General Motors was located in Rochester New York and built carburetors for GM vehicles since 1949 . It is a R4-4MV the 4MV is a divorce choke (remote choke) Rochester Quadrajet 4 barrel carburetor which means the choke is located on the intake manifold connected to the carburetor with a choke rod .They started making them in 1965 and ran threw 1974 trucks up to 1979. Most will have 7/8 inch 20 fuel inlet till 1971 and 1 inch 20 after . This carburetor has a part number of 7029207 and used on 69 Chev & GMC Truck . Check here for specific Muscle car InfoReferenced by ; Rochester 7029207"

 

 

Good morning!

The original carburetor you are looking for is not "terribly" hard to find but they are not cheap usually. There are harder ones to locate and those are more expensive. You need to be careful with this one though if looking for original due to the fact, as others mentioned, it was made well into the 70's unlike some of the super rare ones.
With that in mind, the (70)29207 for a Corvette will have a "DA" suffix after the part number. EARLY models may have no date on the carb body, but should be dated on the base as 68's were. Also, many original carbs will not have the "70" prefix, so the part number on the body will read only "29207 DA". Those are the real deal and not service carbs.
Also, as Allan mentioned, the "0" added in front of the part number is a dead giveaway for a service date.
I have recently seen one on Ebay claiming to be NOS and have a 69 date ($$$). It is not. It is a service carb, likely 1979.
Lastly, 207 carbs that are service replacements or for other vehicles have a triangular nub to the right of the fuel inlet. Another dead giveaway. When I was sorting through all the 207's for sale looking for one I never looked at the dates, I just looked for that nub that sticks out like a sore thumb. If it was there, I moved on. Also, I see those round "dots" around the part numbers, as your pictures shows, often on service carbs.

If you are seriously in the market for a dated carb I think you should expect to pay between $300 to $500 on any given day. Not too bad considering some prices of the really rare ones. What is the build date of your car?

Good Luck!

 

Hi aj,
Thanks very much for filling in the details!!
Regards,
Alan

 

 

I would as Lars what he thinks about that 0 in front of the number of you needed a second opinion. I've read that not all carbs have the plant stamp but thats just what I've read. I havent heard about the nub thing, AvalonJohn, can you post a pick of that if you have them please. I am still learning the intricacies of the Quadrajet myself. Thanks for all the info

 

This is my original 69 29207 DA.

Below is a picture I took off an Ebay ad of a service replacement (not being sold as one). The pen is pointing to that triangular nub thingy (no idea what it is). Dead giveaway for a later carb or replacement. The last picture is my original carburetor w/o the nub.

 

crap I have the nub!!!!!!

Thanks for the pic!!!

 

That "nub" is part of the mounting feature for the solenoid-vacuum switch gizmo added to help reduce emissions on 1970-1974(?) "base" engines. Higher performance engines usually received the A.I.R. pump system.

Having that "nub" just indicates that carb body was used in that time period along with the solenoid-valve emissions feature. If the hole in that nub is NOT threaded, it could mean that the same casting was used for engines that did NOT have the solenoid-valve feature.

At least, that's how I remember it....

 

Are you trying to reference the TCS system (Transmission Controlled Spark)? If so, some of what you have written is inaccurate.

In 1970 all Corvette engines (base, L-46, LT-1, LS-5) had the TCS system installed, but only the LT-1 had the A.I.R. pump installed. California cars would have also had the ECS system (Evaporative Control System) installed.

Regardless of the above, the cast triangle (or nub as shown by avalonjohn) was not found on any original 68-70 Corvette Qjets.

 

Hi,
For 71 the TCS was changed to the CEC (Combined Emission Control).

All 71 engines whether Q-jet or Holley equipped, and whether they had the A.I.R. system or not, used the vacuum/electric solenoid mounted on the left front corner of the carburetor using a small di-chromate plated bracket.

So Q-jet carburetors used for 71 production had the 'pad'.
Regards,
Alan

The bracket on a Q-jet. The screw used to mount the pad is counter-sunk and has a slotted fillister head. 1971 production.




The bracket used to mount the CEC solenoid on a Holley Carburator. This is a spread bore replacement. 1971 production.