1963 Carburetor Date Code

[Gerald C.]

Re: 1963 Carburetor Date Code

If I understand this thread correctly, my carter carb that has CC3 under the 3461S stand for the third shift in March 1963. Am I correct with this assumption?

Thanks

[Thomas B.]

Re: 1963 Carburetor Date Code

This one with single letter code is on my Feb 63 car. Don't know if it is original to the car. Would be October 1962 I believe.

Sorry for the upside down image. Couldn't get it to show correctly.

[Harry S.]

Re: 1963 Carburetor Date Code

I like October of 62. My July 19th, 1963 has CG3. To me that means, third Revision (C), July (G), 1963 (3).

Carburetor 1.jpg

[Duke W.]

Re: 1963 Carburetor Date Code

If I understand this thread correctly, my carter carb that has CC3 under the 3461S stand for the third shift in March 1963. Am I correct with this assumption?

Thanks

Or maybe it was built on assembly line C rather than assembly line A or B. Like I previously said in this thread, coding a "shift" without the actual day of the month doesn't make any sense.

Duke

[Gerald C.]

Re: 1963 Carburetor Date Code

I reached out to Bob Kunz and he said my "CC3" stamping indicates a third shift in March 1963.

[Dave S.]

Re: 1963 Carburetor Date Code

Third shift of March makes no sense as Duke points out. You need to identify an actual date before you identify a specific shift. It is a third revision or a third assembly line or something close to that.

[Gerald C.]

Re: 1963 Carburetor Date Code

Dave,

All I'm doing is repeating what Bob told me. I didn't think this topic would be this hard to identify. Just like the proper tags on the T10 transmission for cars made after vin #12,000.

Jerry

[Duke W.]

Re: 1963 Carburetor Date Code

It is a third revision or a third assembly line or something close to that.

It's not a revision. Minor revisions were indicated by a letter suffix. For example, the 3461S was superseded by the 3721S for 1964. Then minor calibration changes yielded the 3721SA, which was quickly superseded by the 3721SB.

The 3721SB is fairly common because it became the replacement for all 327 AFBs with manual transmissions back to the '62 3269S. I don't know when GMPD discontinued the AFB. My oldest P & A catalog, 9/77, has no complete carburetors listed prior to the '68 model year, but I bought a 3721SB through the aftermarket back in the mid to late seventies.

Duke

[Mike E.]

Re: 1963 Carburetor Date Code

Although this is GM documentation for 1962 rather than 1963, it seems to me it is apropos to this discussion. See paragraph 1, first page.
Scan_20230625.jpgScan_20230625 (2).jpg

[Duke W.]

Re: 1963 Carburetor Date Code

That GM document is clearly unequivocal that the first letter of the '62 3269S AFB is a revision code, and based on this I figure the first letter of my CB3 3461S is a revision code, but we don't know what the changes were. Maybe just adjustments. My AFB has the same rods and jets as specified in the 1963 Corvette Shop Manual.

That leaves the 3720S/SA/SB.

For those that have these models can you post the date codes.

Duke

[Duke W.]

Re: 1963 Carburetor Date Code

Greg,

Post #6 on Gary Beaupre's link above I believe is correct.

"AB3" would be: "A"-> First Revision, "B"-> February, "3"-> 1963

Dave

Interestng that my 3461S is CB3. The revisions were coming fast and furious.

Duke

[David Z.]

Re: 1963 Carburetor Date Code

Duke
The 327 that was in our '65 when we bought it had a 3720SA F4 carb on it. I have no idea as to the originality as it was not the original motor. Don't know if this helps.
CarbStamp.jpg

[Mark F.]

Re: 1963 Carburetor Date Code

So, if I have followed this post and its attachments correctly, here's the data I see utilizing the 1st of three letters as a "revision" - NOT the shift produced - OR the week produced as Holley does w/ some of their carbs (table is listed oldest to newest)...

I can add more if it's provided in responses

'63 Carter Carb Date and Revision Post(1)_001.jpg

[Duke W.]

Re: 1963 Carburetor Date Code

Good info guys. My conclusion is that the revision letter was added as a suffix rather than a prefix beginning with the first revision to the 3720S/3721S that became 3720SA/3721SA.

Duke

[Mark F.]

Re: 1963 Carburetor Date Code

Sorry, I missed Harry's in Post 18 + he sent me a PM saying his is also a 3461S.
updated table follows:

'63 Carter Carb Date and Revision Post..._001.jpg