S&S, 551G (IOG) gear-driven camshaft kit

.550" valve lift. IOG = gear driven camshafts with inner and outer drive gears. Complete kit with installation hardware, bearings and gasket.
Torque direct fit for factory 96" Touring bikes. The strongest cam from idle to 4000 RPM for 96" to 106" engines. Not recommended for compression ratios of 10:1 or higher.
The gear drive system is in fact a revolutionary, different and far more reliable construction. Especially in high lift/performance applications, compared with the factory chain drive design. A gear driven camshaft is stronger and will not suffer any of the mechanical problems associated with factory chain driven camshafts. The S&S gear drive kit will increase valve timing accuracy and therefore power, by eliminating timing chain slack and the loose-fitting factory cam gears. The only downside of gear drive is that you may experience a slight increase in mechanical noise, which is why the factory uses a chain. It has no other mechanical advantage. As the chain guides and tensioner are removed, there is no longer any chance of these parts failing and damaging other parts of the engine. The S&S gear drive kit reverses the rotation of the rear camshaft, providing additional operating clearance between the cams. As a result, greater cam lifts are possible with S&S gear driven camshafts.
Note: With the exception of the 475G and 510G camshafts, adjustable pushrods (such as MCS 503573) are required to compensate for the smaller base circle of the camshaft of these cams.
Note: It may be necessary to remove material from the internal surface of the factory gear cover before installing the S&S outer drive gears (which are required and available as 503577).
Note: Factory beehive valve springs on 04-17 Dyna; 04-17 Softail and 04-16 Touring models will accommodate valve lifts of up to 0.590" and a valve seating force of 160 lb, up to 6200 RPM. Operation above 6200 RPM or with lifts greater than 0.590" will require high-performance valve springs.


Specifications


Brand
S&S


Application
07-17 Softail; 06-17 Dyna; 07-16 FLT/Touring (NU)


Sales unit
Kit


Material
Steel


Packaging weight
2.809 kg


HS Code
84831021


Motorcycle family
DYNA, SOFTAIL, TOURING, TRIKE


Original name
S&S, gear drive 551G camshaft set (IOG)