ROCHESTER Models M4MC & M4ME 4-Barrel: Description

The M4MC carburetor is a 2-stage downdraft design. The primary side has a triple venturi system. The secondary side is composed of 2 large bores using the air valve principle (fuel is metered in direct proportion to amount of air passing through secondary bores).

A baffle is attached to secondary side of the air horn above main well bleed tubes. This baffle deflects incoming air to improve secondary nozzle operation during heavy acceleration. The M4MC uses a bowl-mounted choke housing with thermostatic control assembly.

Model M4ME is used for light duty emission vehicles. The M4ME is basically the same carburetor as the M4MC. The M4ME does not have an aneroid cavity and is equipped with an electric rather than hot air choke.