Standard Main Jet #77 HO122-77 Product:1/4-32" Thread, .0855" Hole Size (Pair) 557-12-10S

557-12-10S

Short throw ratchet action reduces shift time

400 Series Black Push Lock Hose -5AN15 Metre Length

Peak Recall/Memory

Tach / Speedo Mounting Cup3-3/8" Pedestal Mount

Standard Main Jet #77 HO122-77 Product:1/4-32" Thread, .0855" Hole Size (Pair) 557-12-10SStandard Main Jet #771 4 32" Thread, . 0855" Hole Size (Pair) HO122 77 122 77 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.