KPMI, valve spring kit. .415″ lift. Steel top collars

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.