Holley Standard Main Jet #58 HO122-58 Fuel Pumps - Mechanical Available to suit 4150/4500 style

Available to suit 4150/4500 style carburettors such as Holley

custom molded black Cross-Linked Polyethylene (XLPE) high-flow intake tube

Part Number: AF83-1003BLK

Part Number: AU8137

Holley Standard Main Jet #58 HO122-58 Fuel Pumps - Mechanical Available to suit 4150/4500 styleStandard Main Jet #581 4 32" Thread, . 057" Hole Size (Pair) Brand: HOLLEY Part Number: HO122 58 Description: 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.