S&S Cycle SS106-6059 76cc Cylinder Head Kit Silver for Big Twin 86-99S&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 76cc combustion chamber that gives a slight increase in compression for great results with most performance cams. 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
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S&S Cycle SS106-6059 76cc Cylinder Head Kit Silver for Big Twin 86-99