Fits S&S Super Stock® cylinder heads, and fit in stock 1999–'02 Harley- Davidson® Twin Cam 88® engines, 1984–'99 Evolution® big twin engines and 1986–'01 Sportster® and Buell® models. S&S high performance valve springs may also be used in any other heads that require stock O.D. outer spring. Includes 4 top collars, 4 bottom collars, 4 each outer, middle, and inner springs, 8 shims (4 each of .015", and 4 each of .030"), and 8 keepers.
- Use with shoulderless-style valve guides
- Special keepers included fit valves with stock 5/16" stems and S&S collars only
- Spring seat pressure is typically 170 lbs. at stock 1.800" installed height
- Open pressure is 390 lbs. at .560" lift, 415 lbs. at .630" lift
- Patented steel top collars are drilled for lightness and to increase cooling oil flow over valve springs
- Kits are available with low mass titanium top collars for very high performance applications