S&S Cycle 551CE Easy Start Camshaft Kit 106-4947 The 551 cam is designed for engines with 96 to 106 CID and 9:1 to 10:1 compression this is a bolt-in cam set designed for stock or mildly modified touring bikes. Greatly improves low-end and midrange torque, strongest from idle-4000rpm. S&S Chain Drive Easy Start Cams are a great way to increase performance at an affordable price, are installed in a short period of time reusing many stock components, and Easy Start Cams allow stock starter to start any engine. 551CE Cam kit includes cams, gearcover gasket, cam bearings, and instructions Intake Opening (degrees): 15 Intake Closing (degrees): 20