Now S&S heads are available to be used with stock-style flat-top pistons Kits are fully assembled, and include stainless steel valves and high-lift springs Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles) Optimized for smaller displacement engines Slight increase in compression (8.8:1 in an 80" motor) Port design increases flow, while maintaining velocity Set up for .640" maximum lift EFI compatible Natural finish 76cc in chamber Choose between 3-1/2" bore head gaskets 433-794 and 3-5/8" head gaskets 433-795 depending on cylinder bore