High performance valve spring kit. Includes steel top collars, lower collars, valve springs and valve keys. Fits stock Knuckleheads, S&S Knucklehead tins and all S&S KN (Knucklehead) style engines. Note: OEM valve guides may require shortening.
Fits: > 36-47 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines
