Standard Main Jet #71 HO122-71 Akerly & Childs and still have good rpm

and still have good rpm capabilities

DA66110012

Steel Female Rod End With Stud1/2-20 R/H Thread x 1/2-20 Stud

S/S Intake ValveSuit SB Chev

/20 psi SPORT-COMP 2-1/16" BOOST/VAC Includes 6 ft

Standard Main Jet #71 HO122-71 Akerly & Childs and still have good rpmStandard Main Jet #711 4 32" Thread, . 0750" Hole Size (Pair) HO122 71 122 71 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.