Sidewinder valve spring kit. .650" lift

Kit includes beehive springs, chromoly forged top collars, steel bottom collars, valve keepers and shims. Works with both 7mm and 5/16" valve stems and all S&S SuperStock® heads (5/16") valve stems. Springs are single wire conical (beehive) style springs, manufactured from clean high silicon Kobe alloy wire then micro shot peened and nitrided. 650" valve lift. 1.860" installed height, 178lbs valve seat spring pressure and 376lbs@.650" lift. Maximum 6500 RPM.