Stupid Question

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Series ? or S for square bore?
 
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Don't know.
I never gave that any thought, at all.
Just something that Carter thought up.

Crystal ball.jpg
 
I have looked into that too. Can find no definitive answer. Experts disagree with each other. Some indicate that it means different things in different years. Good luck.
 
Got curious.
GOOGLED, and found this.
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 highest engineering change of which I am aware is 4 i.e.938sd. Contrary to popular belief, the S DID NOT mean standard transmission, nor the SA automatic transmission.
 
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