Standard Main Jet #87 HO122-87 111 Series Stainless Braid Cover Auto gage Series Fuel Pressure

Auto gage Series Fuel Pressure Gauge 2179 AU2179 1-1/2"

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Standard Main Jet #87 HO122-87 111 Series Stainless Braid Cover Auto gage Series Fuel PressureStandard Main Jet #871 4 32" Thread, . 1015" Hole Size (Pair) HO122 87 122 87 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.