Carburetor Standard Main Jet - 122-100 1INVENTORY Lower housing casting designed for

Lower housing casting designed for enhanced fuel flow

Application: 1948-1951 Ford F1 Pickup

Why don't the factory coils have these upgrades

which are only used for emissions reasons under light driving

Carburetor Standard Main Jet - 122-100 1INVENTORY Lower housing casting designed forOverview: 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 &