Retro styling with modern technology Newly designed heads based on S&S Cycle heads for Shovels Uses roller rockers for Shovel engines with 1.500 ratio Uses readily available S&S Cycle cylinders for Shovels S&S Cycle hydraulic valve train S&S Cycle Super Stock ignition and billet timer 3-5/8" bore, 4-1/2" stroke 93 cubic inches, 8.5:1 compression ratio S&S Cycle 585 cam S&S Cycle cast pistons Generator style May be installed in 1948-54 chassis if 1955-64 tin primary is used Two year warranty S&S engines are shipped without oil Not legal for sale or use in California on any pollution controlled motor vehicles