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

Racing. Reduces total valve train mass. Great for high-lift racing performance builds. This racing kit has an nstalled spring pressure of 154 lbs (standard is 129 lbs) and can be used from stock up to .600" valve lift. Works with factory covers without interference. The base washer in this kit has been counter bored to allow the seal to fit inside the base washer which increases the retainer to seal clearance for higher lift cams. 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: 1.500". Seat pressure 154 lbs. Open pressure: 389 lbs. @ .600" valve lift.