06-14 T/C 89CC BLACK CYL HEADS

Not for models with OEM compression releases. Not compatible with '14-'16 FLHTK/FLHTKL, FLHTCUTG Twin-Cooled motors or '17 touring models. Will not work with S&S compression releases in a late model twin cam that has Harley Davidson® ACR (Automatic Compression Release) already installed. Must use S&S rocker boxes if S&S compression realses are used. Made in the USA Compatible with stock rocker boxes, exhaust, and intake manifolds S&S® High performance valve springs allow the installation of camshafts with up to 0.650" lift Intake ports flow 264 CFM (Cubic Feet per Minute) compared to stock heads at 182 CFM Large 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 potential Good for touring bikes and other heavy vehicles Combustion chamber provides a slightly higher than stock, but still manageable compression ratio in larger than stock engines Works well with engines of stock displacement, but are ideal for somewhat larger stroker or big bore engines up to 110" Designed for '06-'16 engines with stock crankcase Heads are fully assembled with springs and valves