20-20450 KPMI, valve spring kit. .600" lift. Steel top collars

For those building a high-performance early Shovelhead, this Kibblewhite valve spring kit is a rugged solution for high-lift applications. Designed to fit 1966 to early 1979 Shovelhead models, this kit is sold complete with springs, steel top collars, lower collars, and valve keys. The springs are wound from premium chrome silicone wire, then shot peened and heat treated to ensure they stand up to the rigors of racing. With a maximum valve lift of .600 inches and a seat pressure of 152 lbs, this setup is built to handle aggressive performance builds while reducing overall valve train mass. Note that valve guide seals are not included in this kit. It is a professional-grade upgrade for any mechanic looking to maximize the potential of a classic Shovelhead motor.