Carburetor - HOLLEY 4180-C 4-Bbl: Description

The Holley 4180-C 4-Barrel is a downdraft 2 stage carburetor. It can be considered as 2 separate carburetors: one supplying air/fuel mixture throughout entire range of engine operation (primary stage); the other functioning only when a greater supply of air/fuel is needed (secondary stage).

The primary stage (front section) of carburetor contains a fuel bowl, metering block, and accelerator pump assembly. The secondary (rear) section of carburetor contains a fuel bowl, metering body, and secondary throttle operating diaphragm assembly.

This model carburetor has 5 main systems: idle, main meter, secondary throttle, power enrichemnt and accelerating pump. In addition to these basic systems it also is equipped with a fuel inlet system and automatic choke system.