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There is a lot of erroneous information in the classic car world about the Carter YF vs YFA carburetor. Hopefully this article will help you sort it out.

Basically the YF & YFA is the same series carburetor. The YFA is just a later version of the YF but built with emissions standards.

One of the easiest ways for me to tell them apart is that the YFA uses an aluminum base, while the YF used a cast iron base.
Carter YF CarburetorCarter YFA Carburetor

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