S&S Super Stock heads intended for larger displacement engines, S&S 89cc heads have a whopping 264cfm flow rate (compared to 182cfm for stock H-D® heads), larger valves and .640 inch lift valve springs. S&S recommends Easy Start cams or manual or electric compressions release system in order to maintain reliable engine starting on high compression applications.
- 2006-up big twin models
- Stock and 3-7/8 inch bore
- Heads can be decked up to .060 inch to increase compression
- 2.000 inch intake and 1.605 inch exhaust valves
- S&S .640 inch lift valve springs
- Stock Harley-Davidson® rocker boxes can be retained if S&S manual compression release or S&S Easy Start cams are used.
- Must use S&S valve cover gasket part #90-4124 with stock rocker covers
- Silver powdercoat or wrinkle black powdercoat finish
Silver. . . . 106-3255
Black . . . . 106-3240
