Standard Main Jet, 1/4-32 Thread, .089" Jet size

Part # 122-78

These Metering Orifices Control Fuel Flow Into The Metering System. They Are Rated In Flow Capacity Cubic Centimetres Per Minute And Are Changeable For Tuning Purposes. The Shape Of The Entry - Exit And Size Determines Flow. All Holley Main Jets Are Flow Tested And Then Stamped With The Correct Number.

This Standard Main Jet is a crucial component for fine-tuning your Holley carburetor. Featuring a 1/4-32 thread and a .089" jet size, this Holley carburetor standard main jet precisely regulates fuel delivery. These metering orifices control the fuel flow into the metering system of your carburetor. Achieving optimal air/fuel mixture is possible through interchangeable jets. The flow characteristics are determined by the inlet and outlet shape and size. Every Holley Main Jet undergoes rigorous flow testing to guarantee accuracy, and is stamped with its corresponding flow number. Using this Holley carburetor standard main jet allows for precise adjustments to your engine's performance.