S&S CYCLE S&S® Performance Replacement Low Compression 82cc Cylinder Heads For 1984-'99 HD® Big Twins - Wrinkle Black Powdercoat Finish - 106-4570

S&S^® Performance Replacement cylinder heads for 1986-'99 HD^® Evolution^® big twin engines are designed to be compatible with a stock style flat topped piston. This set has a slightly larger 82cc combustion chamber making them idea for larger displacement applications, producing a managable compression ratio. These heads are original equipment on S&S^® V96 and V80 engines. Larger than stock 1.900" intake and 1.575" exhaust valves provide plenty of air while maintaining port velocity for good low and midrange response. S&S^® high lift valve springs allow the installation of cams with up to .585" lift. Compatible with stock intake manifolds, exhaust systems, and temperature sensors for EFI equipped models. Wrinkle black powder coat finish.

• 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 (.585") 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) with 82cc chamber volume
• Port design increases flow, while maintaining velocity
• Set up for .585" maximum lift
• EFI compatible
• Made in the U.S.A.

Fitment Guide

Specs