S&S Cycle

1926–'84 vintage engines

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

HIGH-PERFORMANCE VALVE SPRING KITS FOR 1948–'84 BIG TWIN ENGINES

.550" LIFT DOUBLE VALVE SPRING KIT For 1948–’84 big twins with up to .550" lift.

• Includes 4 inner springs, 4 outer springs, 4 aluminum top collars and late 1981–'85 bottom covers • Use with stock-style bottom collar, valve guides, valves with stock 3⁄8" stem, and stock keepers • Compatible with thin-stem valves if thicker keepers (that maintain correct valve stem-top collar engagement) are used • Late single bottom collars are available for use in S&S cylinder heads for shovels and stock late 1981–’85 heads

90-2053

S&S® .550" VALVE SPRINGS SPECIFICATIONS—1948–’84 BIG TWIN Lift Installed Height Seat Force Force @ Max Lift .550" 1.500" 150 lb. 343 lb.

.550 LIFT VALVE SPRING KIT FOR 1948–'84 PANHEAD AND SHOVELHEAD ENGINES Description Part # For 1948–'84 Panhead and Shovelhead Engines 90-2053 Bottom Collar–Late 1981–’84 18222-81 (each) 90-2038

NOTE: Panhead engines usually require clearancing between rocker cover and top collar.

S&S® .590" VALVE SPRINGS SPECIFICATIONS—1981–’84 BIG TWIN Lift Installed Height Seat Force Force @ Max Lift .590" 1.480" 157 lb. 356 lb. .590" LIFT TRIPLE VALVE SPRING KIT For 1981–’84 big twins and S&S SH and P Series heads with up to .590" lift. • 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

.590 LIFT VALVE SPRING KIT FOR–1981–’84 BIG TWIN Description Part # For Late 1981–’84 and All S&S Cylinder Heads 90-2063

NOTE: .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, part #90-2063. When ordering replacement valve springs for S&S cylinder heads for shovelhead engines, order the 1981–’84 style part #90-2063.

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