106 3240 Super Stock Cylinder Heads Harley Davidson FLD 1690 2012 2013 Powder Wrinkle

Features: Heads are fully assembled with springs and valves. Designed for '06-'16 engines with stock crankcase. Good for touring bikes and other heavy vehicles. Works 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 engines. 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. 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. Compatible with stock rocker boxes, exhaust, and intake manifolds. Made in the USA. Will 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..