S&S, valve spring kit. STD to .480" valve lift - 36-47 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines Engines Installs with silicone over head

Installs with silicone over head of existing bolts

509030 26348-15 woodruff key

Mounting note: Model specific hardware kits are available as 559463 for 91-03 Sportster

Will give excellent suppression of EMI (Electro magnetic) and RFI (Radio Frequency) signals to ensure the electronics on the bike will work flawlessly

S&S, valve spring kit. STD to .480" valve lift - 36-47 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines Engines Installs with silicone over headHigh 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.