S&S 551 Cam - Twin Cam Chain DriveDesigned for engines with 96 to 106 CID and 9: 1 to 9: 9 compression, this is a bolt in cam set for stock or mildly modified touring bikes More power across the rpm range, with improved low and midrange torque, strongest from 1,000 4,000 rpm Cams for '06 Dyna and '07 '17 Twin Cam are for use with models with hydraulic tensioner chain drive system Not recommended for compression ratios of 10: 1 or greater. Installer must check coil bind, valve to valve
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