20-20850 KPMI, valve spring kit. .415" lift. Steel top collars

This Kibblewhite valve spring kit is an excellent choice for late 1979 to 1984 Shovelhead owners looking to perform a high-quality top-end rebuild. Designed for a .415-inch maximum valve lift, these springs are wound from premium chrome silicone wire that has been shot-peened and heat-treated to ensure a long fatigue life. The kit includes springs, steel top collars, lower collars, and valve keys, providing everything needed for the install. These components are engineered to reduce total valve train mass, making them perfect for OEM-spec rebuilds. With a seat pressure of 129 lbs and an open pressure of 272 lbs at full lift, they offer reliable performance. Note that this kit is intended for use with .625-inch diameter valve guides and is sold as a kit.