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There are four basic model "2-Jet" Rochester carburetors. They are the Models 2G, 2GC, 2GV and 2GE. There are two different throttle body flanges used on the Rochester 2-bore carburetors. They are SAE (1-1/4") and (1-1/2"). Larger engines normally have more air capacity, hence, larger carburetor bores and flanges are needed on these applications.

The 2G carburetor is equipped with a manually-operated choke valve. Its main applications are on marine and truck applications.

The 2GC carburetor has an automatic choke which is an integral part of the carburetor unit. The automatic choke housing with thermostatic coil may be located on the air horn or throttle body, depending upon the application.

The 2GV carburetor is also an automatic choke model; however, a vacuum break diaphragm unit(s) is used in place of the conventional choke housing and choke piston. The choke thermostatic coil is located on the engine intake manifold and is connected to the choke valve by linkage.