Standard Main Jet #104 HO122-104 Product:1/4-32" Thread, .134" Hole Size (Pair) They're offered in a variety

They're offered in a variety of heights to accommodate most any combination of carb and spacer

HRP-6522D-20

As used on award winning elite show cars

AF111-060-1MBLK

Standard Main Jet #104 HO122-104 Product:1/4-32" Thread, .134" Hole Size (Pair) They're offered in a varietyStandard Main Jet #1041 4 32" Thread, . 134" Hole Size (Pair) HO122 104 122 104 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.