Carter AVS 4615S -vs- AVS4615SA

Jax_1975_Dart said:

Carter used the suffix letter S to denote assembly. Since all carburetors are composed of multiple parts, the letter S was appended to all carburetors using the traditional numbering system i.e. 938s. If a significant engineering change was made to the carburetor, the letter “A” would be appended to the S (i.e. 938sa). A second change would have the letter A replaced by the letter B (i.,e. 938sb).

The kits are most likely the same for both models but, might be worth calling a company like Mike’s carb company or Daytona Carburetor Co. to verify.

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tallhair said:

Fixed title for you

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69-beeper said:

Sorry about the title, it should be:

“ Carter AVS 4615S -vs- AVS 4615SA “

What is the difference between these two?

From what I see visually is the 4615S has one idle mixture adjusting screw, and the 4615SA has two closer to the base where the 4615S has this area capped off. Difference or Purpose?? The 69 Plymouth Service Manual only references and shows pics of the 4615S model.

Also, where would I find a rebuild kit for the AVS 4615S or 4615SA? All the rebuild kits I see for the Carter AVS are not specifically for the 4615 series. Will any of them or a specific other # work?

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kramer said:

I believe the single screw version (it was mounted midway up or so on the front of the carb) was early 69 which is actually an adjustment for idle air and the later two screw versions (down low on the carb) they adjusted fuel which is the way most carbs are setup. I believe with the single screw versions they also had lower idle idle mixture screws as well they were just hidden behind some plugs and they need to be removed to have access to them.

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