.590" lift triple valve spring kit for 1948–early 1981 Harley-Davidson® big twin models.
- Includes 4, steel top collars, 4 bottom collars, 4 each outer, middle, and inner springs, shims, and 8 keepers.
- Use with stock valve guides, stock valves with 3/8" stem, and stock keepers.
- Compatible with thin-stem valves if thicker keepers that maintain correct valve stem-top collar engagement are used.
NOTES: 590" spring kit is year-group specific because of different bottom collars supplied with early and late kits. S&S heads require late 1981-'84 style kit PN 90-2063.
When ordering replacement valve springs for S&S cylinder heads for shovelhead engines, order the 1981-'84 style PN 90-2063.
This is a direct replacement for Harley-Davidson® part numbers 18201-57B and 18204-36A.
Note: All reference to H-D® part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle's products are original equipment parts or that they are equivalent to the corresponding H-D® part number shown.
