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I am setting up a dual carb on my 235 and have what I hope are matching carbs. The stamped flange has (H37 964S) on one carb and (A37 964S) on the other. I have not been able to find out what the difference is between the H and the A. I am thinking just a revision as the are a few differences on the accelerator pumps on these two. Thanks in advance for any help.

Check the main jets and see if they are the same,some Carters were made for Ford apps.and share the same no.


Pete

Could be just a date code.

The carbs are known as YF as you may know already. One barrel downdraft. The "S" is Carters symbol for "assembly", I.E. not a part. Since the YF's were built between 1932 and 1962, it seems likely that the A37 and the H37 are Jan and Aug of 1937 but at the same time it's pretty incredible that you have two carbs of the same year. They are the same model and should be exactly the same. The revisions were marked "A", "B", and so on just after the "S". (964SA). Pretty sure the carbs are GM, not Chrysler or Ford.

Were the Carter YF carbs first used in "32". I know that is the first year for the 216 but I have a Carter manual the shows the YF from "37" thru "62". It would be even more incredible if I had at least one carb from the first month and first year they were produced. By the way, I got the engine running and it at least idles pretty good.

The Carter YF was released in 1950.

Carter did release "replacement" units to replace earlier carburetors.

The last production YF was 1982.

The YF was modified and became a new model, the YFA in 1975. YF's and YFA's were produced concurrently from 1975~1982. The YFA production was continued through the 1986 model year.

Jon.

Maybe I should have said "where available" for 32-62. "There are several versions of the YF. Its just a universal replacement carb as said. Available in both mounting stud sizes. The 1932-53 216 had the smaller mount and the 1950-62 the larger" (32-62)
They are much more simple than the Carter W1 version used from 1932-49. I did a lot of research on the web from several carb "experts" including great info from CarbKing's website.
Anyway looks like the W1 stopped in 49 which would mean that the YF started in 1950 as CarbKing said. If the 37 means 1937 then I guess your carbs are W1. If your Carter Manual says 37 to 62, then there is a good possibility that info is correct, after all it's from Carter! SO... in that case they are YF's. (if the 37 means 1937) There is always conflicting info from experts because these parts go way back and the info is lost except from memory, urban legends, bar room talk, old books and some actual experience. Glad to hear they run, you have actually reached the bottom line. Lay some rubber.

You really should do more research.

I have posted many times that the letter/number combination with the identification number is the date code. The ones in this thread by the original poster were produced in 1957.

As to the charge for identifying carburetors; true to a certain extent, but not what you suggested. We have approximately 60,000 different carburetors identified on our website.

Some are too lazy to look; and once in a while, a truly unusual carb appears that is not on our website, and requires us to do the research. It is our business. Before we required the charge, we averaged about 50 calls a day from junk yard scrounges wanting to identify carbs so they could determine if they wished to buy them. This tied up the telephone lines preventing customers from getting through. You might be surprised at how many willingly pay to have something rare identified, and then it shows up on ebay.

And not all YF carburetors are universal replacement. MOST were used as original equipment. There are several hundred different in approximately 9 different sizes.

Jon.

Looked on your website under "Carburetor identification" and did not see years for YF or how to date them. What does the "A" the "3" and the "7" mean on the posters carbs and the "H". I assume the "7" is 1957. is the 3 the third decade? (30's, 40's. 50's) and "A" and "H" the month? I do realize that in business there is proprietary information that takes years to develop and expense and is part of the service provided to paying customers. I respect that and your company and did not wish to disrespect you. I have removed the language from my post. Thanks Carbking.

Generally, Carter used a 2 character code for the date code. This was in the format "m" "y"; where "m" was a letter representing the month (A for January, B for February, etc.) and "y" was a number representing the last digit in the year produced.

Some date codes from the mid 1950's through the mid 1960's used a three character code, in which case the code was in the format "m" "w" "y" where the "w" was a number representing the week within the month. Thus the A37 decoded to the third week of January 1957.

One has to use the proverbial "grain of salt" with the year (and the month, see below). The 964s was not produced prior to 1950, and not produced after 1965, so the 7 represents 1957, but most would not have access to the discontinuance dates.

As to the month, some years the letter "I" was used, and some years the letter "I" was omitted. In the years with "I"; "L" would represent December. In the years without "I"; "M" would represent December.

Your earlier comment about the SA, SB, SC, etc. is absolutely correct. Engineering changes would have the suffix changed to reflect a minor change. There should be no difference in the OP's A37 and H37 IF both were in factory virgin condition. Differences that may exist can be attributed to different aftermarket kits, or the ingenuity of Dr. Goodpliers (the evil twin of Mr. Goodwrench)!

Really, the date code for an aftermarket carb (the 964s is an aftermarket carb) is trivial as is represents only the date of production for that specific unit, nothing else. On O.E. carburetors for numbers matching cars, the date code IS important.

Jon.

One other comment for the original poster:

While YF's can be used successfully in a multiple carb environment, other carbs can be more easily adapted; as the YF has a vacuum power system.

Thus when introducing YF's into a multiple carb environment, adjustment is much easier if the various springs (which fatigue) in the vacuum power system are replaced with new. Generally, these springs are mail order only.

We suggest that carbs with a mechanical power system (such as the Carter W-1) be used in a multiple carb setup; or change all of the spring.

Jon.

I purchased these carbs rebuilt and ready to run. Not quite the case I have found. They must have been rebuilt by someone not knowing much if anything about carbs as little adjustment was done (correctly). I will try to order springs.

Get them from Carbking (Jon) if he has them. PM him from your post string here.