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 .650- lift
Intake ports flow 264 CFM (Cubic Feet per Minute) compared to stock heads at 182 CFM
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.
