



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.
Product Style | Item # | Store SKU | Manufacturer Product # | Availability |
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Product Style S&S Cycle Sidewinder .650" Valve Spring Kit For Harley Big Twin 1984-2004 | Item # 1181990 | Store SKU | Manufacturer Product # 900-0050 | Availability In Stock: Ships within 24 hours |