S&S CYCLE Cam - 551 Series - Gear Drive - Twin Cam 106-4868

If you're running a Twin Cam 106 and want measurable gains in low-end torque without a complete engine rebuild, the S&S Cycle 551 Series Gear Drive Cam delivers where it counts. By eliminating timing chain lash and enabling higher lift profiles, this cam kit transforms your power band—especially in the 1,000–4,000 rpm range where touring bikes spend most of their time. The gear drive design also provides the precision valve timing accuracy that chain-driven systems simply can't match.

What's Included & What You Need to Know:

• Camshaft gear drive kit
• Inner and outer gears
• Inner and outer bearings
• Gasket set included
• Professional installation required
• Hydraulic press mandatory
• Gear cover machining needed

Performance & Compatibility:

• Designed for touring bikes
• 9:1–9.9:1 compression ratio
• Increased low and midrange torque
• Strongest 1,000–4,000 rpm
• Works with stock pushrods
• Compatible with stock springs
• Compatible with stock lifters
• Reverses rear cam rotation
• Eliminates timing chain lash
• Enables higher cam lifts

Installation Notes:

• Requires bearing replacement
• Requires new gaskets
• Verify coil bind clearance
• Check valve-to-valve clearance
• Check valve-to-piston clearance
• Expect increased valve train noise
• Made in the U.S.A.