Standard Main Jet #63 HO122-63 Product:1/4-32" Thread, .062" Hole Size (Pair) 45° Full Flow AN Bulkhead

45° Full Flow AN Bulkhead -8ANBlue Finish

Supercharged combinations with little or no additional modifications

Weld-On Aluminium Tank EndsSuit 3-1/2" Tube With Smooth Bowl Style

stock replacement

Standard Main Jet #63 HO122-63 Product:1/4-32" Thread, .062" Hole Size (Pair) 45° Full Flow AN BulkheadStandard Main Jet #631 4 32" Thread, . 062" Hole Size (Pair) HO122 63 122 63 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.