Trying out a spreadbore carb on the Duster.

Am I missing something? It looks like a spreadbore to me

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Technically, it is. Though people will argue. The proper classification for the smaller AFB and AVS carburetors is spread bore, but square flange. Most people only call a carburetor spread bore if the secondaries are the size of beer cans like The TQ and Quadrajet. So, for garage speak, the smaller AFB and AVS carburetors are called square bore.....but they really aren't.