HEADS 06-17TC 89CC SLVR

89 cc Super Stock® Cylinder HeadsHeads are fully assembled with springs and valves Designed for '06-'16 engines with stock crankcaseGood for touring bikes and other heavy vehiclesWorks well with engines of stock displacement, but are ideal for somewhat larger stroker or big bore engines up to 110"Combustion chamber provides a slightly higher than stock, but still manageable compression ratio in larger than stock enginesLarge 2.000" intake and 1.605" exhaust valves maintain port velocity for good low and midrange response, but supply enough air for slightly larger engines to perform to their full potentialS&S® High performance valve springs allow the installation of camshafts with up to .650" liftIntake ports flow 264 CFM (Cubic Feet per Minute) compared to stock heads at 182 CFMCompatible with stock rocker boxes, exhaust, and intake manifoldsMade in the USAWill not work with S&S compression releases in a late model twin cam that has Harley Davidson® ACR (Automatic Compression Release) already installed.Not compatible with '14-'16 FLHTK/FLHTKL, FLHTCUTG Twin-Cooled motors or '17 touring models.Not for models with OEM compression releases.Must use S&S rocker boxes if S&S compression realses are used.