The float operates the needle valve, letting fuel flow in when the level drops and closes when the correct level is reached. On the bottom for the carburetor you typically have two jets.

Items like power valves, vacuum pistons, floats, springs, and the like have to be special ordered. See All 21 Photos 02. Carburetor assembly begins with the air horn and the primary float needle ...

The solenoid lifts a plunger, or needle, off its seat 10 ... and is "over-ridden" when power valve opens. For a real-world test of Holley's adjus-to-carb, we mounted a 600-cfm model 4160 (PN ...

The needle valve is a fuel-flow traffic cop that prevents or allows fuel flow into the carburetor. It's typically a rubber-tipped, brass valve piston that slides inside a brass cylinder bore ...

The choke valve in an engine's carburetor, whether it's a Holley carburetor or another brand, helps a cold engine start by restricting some of the airflow into it. When the engine is cold ...

Using your manual as a guide, reassemble the carburetor (install any new components included in the rebuild kit such as gaskets, needle valve, etc.). Reinstall the carburetor to the engine ...