S&S CYCLE Valve Spring Kit — 0.550" lift, 140 lb seat pressure – 48-84 Big Twin, 79-84 Touring, 82-84 FXR, 84 Police
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Allows additional rocker clearance for '48-'65 Panheads; includes late single bottom collars for S&S and stock late '81-'85 heads; works with stock-style bottom collars and thin-stem valves with thicker keepers.