S&S Cycle 635 H.O. Chain Drive Cam Kit for 2006-2017 Harley-Davidson Twin Cam Big Twin

S&S Cycle 635 H.O. Chain Drive Cam Kit for 2006-2017 Harley-Davidson Twin Cam Big Twin

When your engine is already built – bored out, ported, and running more displacement – you need a cam that can match the commitment. The 635 H.O. unlocks the full potential of a modified Twin Cam, delivering an aggressive top-end surge that stock and mild-grind cams leave sitting on the table. This is the cam for riders who finished the build and want everything their engine has.

Key Features

• High-output grind optimized for modified 106ci-plus Twin Cam engines
• Chain drive design maintains the stock cam chest configuration
• Maximum top-end power output in the S&S Cycle Twin Cam chain drive cam lineup
• Highest lift in the S&S Cycle Twin Cam chain drive lineup at 0.635″
• Pairs with S&S Cycle and aftermarket high-lift valve spring kits

Technical Specifications

• Lift: 0.635″
• Drive Type: Chain Drive
• Target Engine: Modified Twin Cam 106ci and above
• Valve Spring Requirement: High-lift springs required – stock springs max 0.590″ for 2005+

Fitment Notes

• Fits 2006 Harley-Davidson Dyna models and 2007-2017 Big Twin models
• Requires high-lift valve springs – stock springs are not sufficient for this cam
• Intended for modified engines displacing 106 cubic inches or more
• Not recommended for stock or mildly modified engines
• Review the Fitment tab for complete year and model breakdown