Holley Main Jets 66 #122-66 6053180 40mm Posistop Chuck Stop

40mm Posistop Chuck Stop

Product Line: Proform Ford Racing Licensed Stamped Steel Valve Covers

Thread File No

R8 Mount to Jacobs Taper Drill Chuck Arbor

5 year warranty

Holley Main Jets 66 #122-66 6053180 40mm Posistop Chuck StopThese metering orifices control fuel flow into the metering system. They are rated in flow capacity cubic centimeters 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. Standard Main Jet . 066" Jet size 1 4 32 Thread Sizes from 40 110 Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 & 4500