S&S CYCLE Cylinder Heads - 79 cc - Super Stock® - Twin Cam 106-3227

Cylinder Heads - 79 cc - Super Stock® - Twin Cam
Heads are fully assembled with springs and valves, Designed for stock 88" to 103" engines or slightly modified engines up to 110", Moderately sized 1.940" intake and 1.575" exhaust valves maintain port velocity in smaller displacement engines for good low and midrange response, S&S® High performance valve springs allow the installation of camshafts with up to .650" lift, Combustion chamber provides a significantly higher than stock, but still manageable compression ratio, Heads can be decked up to .060" to increase compression, but will require piston valve pockets to be re-machined, Compatible with stock rocker boxes, exhaust, and intake manifolds, Machined for S&S® electric or manual compression releases, Made in the USA, Should not be used with any piston having a pop up dome., Not compatible with '14-'16 FLHTK/FLHTKL, FLHTCUTG Twin-Cooled motors or '17 touring models., Must use the included S&S valve cover gasket kit with stock rocker covers., Must use S&S rocker boxes if S&S compression releases are used.