Standard Main Jet #58 HO122-58 Product:1/4-32" Thread, .057" Hole Size (Pair) AF932-08S-25

AF932-08S-25

AF999-12SSH

AF465-40BL

Holley Performance fuel pumps and modules deliver maximum fuel flow throughout a wide pressure range to support major horsepower

A great cooling aid

Standard Main Jet #58 HO122-58 Product:1/4-32" Thread, .057" Hole Size (Pair) AF932-08S-25Standard Main Jet #581 4 32" Thread, . 057" Hole Size (Pair) HO122 58 122 58 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.