• Kit includes cams, inner and outer gears, gaskets, bearings, bolts and heavy-duty bearing plate

551 SERIES GRIND CAMS

• More power across the rpm range, with improved low and midrange torque
• Can be used with stock pushrods, springs and lifters
• Strongest from 1000-4000 rpm
• 99-04 models require high lift springs
• Designed as bolt-in cam for touring bikes with compression ratio between 9:1 and 9:9

• Camshaft gear drive kits increase valve timing accuracy by eliminating timing chain lash and loosely-fit stock chain drive
• Reverses the rear cam's direction of rotation, providing additional operating clearance between cam lobes; as a result, higher cam lifts are possible with the gear drive kit
• Kits include cams, inner gears, outer drive gears, inner and outer bearings, gasket and instructions
• Material must be removed from the inner surface of the stock gear cover to install S&S gear drive cams
• A hydraulic press and other professional-level tools are required to install these kits
• S&S recommends that adjustable pushrod/cover kit PART #0928-0017 be used
• Cam bearings and gaskets must be replaced when installing new cams
• Cams are also available with inner gears only; intended for cam replacement for motors that have already been converted to an S&S gear-drive system
• Made in the U.S.A.
• Cams for 00-06 Twin Cam are for use with stock splined drive gears; for installation on 99 Twin Cam motors you must purchase splined outer drive sprocket; S&S recommends that Andrews 4340 steel drive sprocket PART #DS-199175 be used
• Cams for 06 Dyna and 07-17 Twin Cam are for use with models with hydraulic tensioner chain-drive system; cams 510C and 551C are bolt-in applications, all others require high-lift valve springs
• Made in the U.S.A.

NOTE: Kits require high-performance valve springs (except 509G and 510G) when installed in 99-04 models.

NOTE: Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.

NOTE: Due to the inherent characteristics of gear drives, you may experience more valve train noise.

NOTE: Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.

NOTE: Exempt per Carb Executive Order (EO) D-355-14.