These quality solid lifter tappets fit 1936-'47 HD® knucklehead and S&S® KN-Series engines for 1936-'47 chassis. Tappet assemblies include adjusting screw and locking nut. Note that two different tappets are used in each engine. Tappets for the intake valves are slightly shorter than tappets for the exhaust valves. Available individually. +.005"