Carburetor Standard Main Jet - 122-54 2WD This system is especially recommended

This system is especially recommended for towing applications since the tailpipe exits behind the right side rear wheel

with welded O-ring seals

1967 - 1974 GMC K2500 Pickup

Part Number: 817504

NOTE: - Does not fit with angle plug heads or raised port heads

Carburetor Standard Main Jet - 122-54 2WD This system is especially recommendedOverview: 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 &