S&S Cycle Sidewinder .650" Valve Spring Kit For Harley Big Twin 1984-2004

S&S Sidewinder .650" Valve Spring Kit For Harley Big Twin

Sidewinder .650" Valve Spring Kits for Big Twins with stock heads that use both 7mm and 5/16” valve stems as well as all S&S Super Stock heads that use 5/16” valve stems. Works well with cams up to .650" lift. 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. Chromoly forged retainers.

Features:

• Include springs, shims, 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