Chevrolet Caprice 1990 Automatic Gasoline New Holley carburetor for sale for classic cars. The part shown in the picture is a complete and inverted fuel and air intake system assembly, viewed from the bottom (carburetor base). It consists of a Holley 4-barrel carburetor connected to a braided dual fuel line, mounted on top of the chrome air cleaner base. Explanation of parts and components: Carburetor: Clearly visible from the bottom with its four openings (4-Barrel). The two smaller openings are the Primary openings for daily use, and the two larger openings are the Secondary, which open when the pedal is fully pressed to increase power. Filter (Air Cleaner Base): The shiny chrome circular part at the bottom. This represents the base of the sporty air cleaner that protects the engine from dust. Fuel Line: The braided side tube with colored connectors (blue and red) to evenly supply gasoline to the carburetor chambers.