Carburetor Standard Main Jet - 122-50 FineLInes the system maintains performance under

the system maintains performance under extreme conditions and increases both heat and burst resistance as well as mating surface adhesion compared to rubber

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Carburetor Standard Main Jet - 122-50 FineLInes the system maintains performance underOverview: These metering orifices control fuel flow into the metering system. They are rated in flow capacity "cubic centimeters 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. Click on Catalog Product Page for complete listing of jets and sizes. Features: Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 &