551 cams are bolt-in cams for 1999-'06 engines. Cams that exceed the limits of the stock valve springs require the use of special high lift springs. Most S&S cams have higher lift than stock and are designed to take advantage of the extra flow of ported stock heads or S&S Super Stock® heads. Due to the high lift of these cams, S&S adjustable pushrods are recommended. Not all grinds are available in the chain drive version. To get the best performance from a performance cam installation, a high flow intake and exhaust system is also recommended.

• 2005-'06 can use stock valve springs while 1999-'04 will need special valve springs
• 551 cams are not recommended for compression ratios of 10:1 or greater
• Designed for engines with 96 to 106 CID and 9:1 to 9:9 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
• Kit contains cams, gearcover gasket, cam bearings, and instructions
• Quick installation and Easy Start® Cams allow stock starter to start any engine