fits  36-47 Knucklehead (NU)

Reduces total valve train mass. Great for OEM rebuilds with stock specifications from stock .348″ lift to a maximum of .415″ valve lift. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .415″. Installed height: 1.375″. Seat pressure 127 lbs. Open pressure: 270 lbs. @ .415″ valve lift. Note: Components are stock style replacement and can be used without modifications.

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Home > Parts > Engine > Top End > Valves > Springs & Spring Kits > KPMI, valve spring kit. .415″ lift. Steel top collars

fits  L79-84 Shovelhead (NU)

Reduces total valve train mass. Great for high lift racing performance builds. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .600″. Installed height: 1.510″. Seat pressure 152 lbs. Open pressure: 387 lbs. @ .600″ valve lift. Note: Does not include valve guide seals.

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Home > Parts > Engine > Top End > Valves > Springs & Spring Kits > KPMI, valve spring kit. .600″ lift. Aluminum top collars