AFB specs

[TheTempest]

Does anyone know of a source for factory original AFB specs? I'm looking for information on jetting, CFM ratings etc.

Thanks.


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Mike
'67 Tempest Custom
Post Coupe

[TheTempest]

Does anyone know of a source for factory original AFB specs? I'm looking for information on jetting, CFM ratings etc.

Thanks.


------------------
Mike
'67 Tempest Custom
Post Coupe

[carbking]

mudhen, Carter published CFM specifications on very few original equipment AFB carburetors. These were sold for a specific application, and the CFM rating was of no significance at the time. The only OE AFB that I have seen a published rating is the 3721S (Chevrolet) at 575 CFM. The aftermarket 9000 series were rated (and published), as follows:

400 CFM - 9400S, 9410S
500 CFM - 9500S, 9501S, 9510S, 9511S
625 CFM - 9625S, 9626S, 9627S, 9635S
9636S, 9637S
The above apply to the original 9000 series produced by Carter in the early 1970's. I do not have complete information on the new 9000 series beginning in the 1990's.

Also, the Competition Series Carter AFB carbs (late 1960's) were rated as follows:

500 CFM - 4758S, 4762S
625 CFM - 4759S
750 CFM - 4760S, 5761S

As far as I know, none of the OE Pontiac AFB carbs had published CFM figures. I have seen internal test results on most and can tell you they vary from about 500 CFM (late 1950's) to 939 CFM (3636S super duty).

Original jetting, metering rods, springs, etc., were published for MOST OE carbs in a looseleaf book available to Carter Service School graduates, and also to jobbers, and distributors. General format was from 2 to 8 pages of specifications per carburetor (or group of carburetors). The books covering 1946 to 1960 are fairly common at swap meets, and/or Ebay. The pre-WWII books, while not as common as the 46-60, also are not difficult. Books from 1960 up are tough. There are some individual pages showing up on Ebay from time to time. Some of the really low production carburetors were never documented to the general public. Carter had internal documents called TFN's (temporary field notices) which documented these units. All of the Pontiac SD carbs except the 3010S fit this category. Jon.

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Good carburetion is fuelish hot air.