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.

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