Carb date codes

-
matthon

matthon

Well-Known Member
Joined
Aug 29, 2008
Messages
3,154
Reaction score
1,590
My understanding is the date is a letter that corresponds to the month of the year, and the 4 numbers and letter tell you the year, car, engine.
I know what 4298S is, and J would be October- if all of this is correct what is this? It looks like maybe: 2 Js then JO.
I have seen similar carbs with only 1 letter before the 4 numbers/letter.

!BVBcfb!CGk~$(KGrHgoH-DcEkJw1zHMKBKQZGSiUFQ~~_3.jpg
 
October 1970 most likely

Correct, J = October
0 is the year designator
 
So this one would be April 1967?

!Bp+7yHgB2k~$(KGrHqIOKjIEuZz(CnvpBLt2oP6LOw~~_3.jpg
 
Ok…. If….. J = October and 4298s = 1967. 0 would need to = 1966.

This would give you a 4298S with an October 1966 date code. This would all jive with a carb made for the 1967 model year.


I think the 0 should be a 6. The 0 could not be a 7 because J7 would = 10/1967.

10/1967 would = 1968 and 4298S was not used in 1968.


So I have 2 theories.

1. The carb, specifically the "0" was incorrectly stamped.

2. "0" was used for 1966 carbs built for the 1967 production run and they switched to a 7 on January 1st 1967.


I say , JO = 10-1966.


Note. Im pulling most of this out of my butt.
 
How about this……. We know that 4298 = 1967

So J0 4298S

J = October
0 = The 10th


So my new theory…… JO 44298S = October, 10th for the 1967 model year.
 
If the letter is the month that would make sense as I have seen up to L, and I have seen letters to represent months on other things.
The number I can't figure. If it is the day, how do you make the 10th, 20th, and 30th different? If it is the day of the month then they never made a carb after the 9th because I have never seen 2 digits after the letter.
Then we are back to the 4298S which is 1967 only- so we have the year, the transmission and the engine.
What we don't have is the month and the day, J0 or D7.
There are other things that change over from December to January, even though the model year continues.

So, I have 2 carbs with the following info- one of them has to be the better choice as far as date codes go to rebuild.

4298S J0 with a tag 4298S 2590
4298S D7 with a tag 4298S
 
i think those are replacement carbs, that is a 67 383 m/t carb that was built in 1970 as a (over the counter) replacement.
 
I think I got it:

http://www.moparmusclemagazine.com/...taking_inventory_date_coding/date_window.html

Some types of Month/Day/Year date-codes substitute the month numeral with a letter. On many of these types of date-coding, the Day numerals are deleted, leaving only the Month/Year. Typically, A is January, B is February, and so on with the exception of the letter "I," which was deleted most of the time because it could be mistaken for the number "1." Therefore, month alpha codes are as follows:

A = Jan. E = May J = Sept.
B = Feb. F = June K = Oct.
C = March G = July L = Nov.
D = April H = Aug. M = Dec.

4298S J0 - replacement carb dated Sept 1970- or the 0 is really a 6 making it Sept 1966 which would make sense. It really looks like a 0 up close, but it is not stamped as well. Did they make replacement carbs for older models regularly?
What's with the 2590 below the 4298S on the tag?

4298S D7 - original carb dated April 1967- which is perfect for my car.
 
2590 = two hundred and fifty ninth day of 1970. correct on the I not being used. just like all other parts that you could buy for your car, over the counter carbs were sold too. I could go to my local dodge dealer today and buy a new intake and throttle body with the correct part #'s but most likely date codes about 3 to 6 months ago, with different paint daubs ect..
 
Sept 16th is the 259th day of the year, which matches J = Sept.

Kool!

I have the correct carb and a replacement.

Thanks FABO!
 
I messed up on the J = october. Got lazy and just ran the alphabet.

"I" wasn't used because it looks like a 1.
 
You must log in or register to reply here.
-

Back
Top