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If you are using heavy weight oil (20W to 60W) we recommend to purchase the AF59-2016-60 which is a 60 micron
Weld-On Billet Radiator Neck 32mm I
Gloss Black 180° Silicone Elbow Hose 1-1/2" (38mm) I
Inline Check Valve -12ANSilver Finish
Standard Main Jet #67 HO122-67 Crankshaft Keys If you are using heavyStandard Main Jet #671 4 32" Thread, . 0663" Hole Size (Pair) HO122 67 122 67 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.
