S&S Sidewinder Valve Spring Kits For Harley
Manufactured from ultra clean high silicon Kobe alloy wire then micro shot peened and nitrided. CNC machined 9 degree locks, high performance conical single wire spring, and chromoly forged retainers. Works well with cams up to .650″ lift. High performance conical single wire spring. 
Features:

Includes springs, upper and lower collars and keys

For valve lift to .650″ with 1.860″/178 lbs. installed height, 376 lbs. at max lift

Max 6500 rpm

Made in the USA