Intake tappet only. Solid lifter tappet to fit OEM Knuckleheads. Also stock replacement for S&S KN-series (Knucklehead style) engines. Note: See Fmc-531-590 for a complete +.005" intake & exhaust tappet set. Note: Special Order Product only. To order please contact your FMC sales representative.
Fits: > 36-47 Knucklehead; All S&S KN-series (Knucklehead style) engines
