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S&S Cycle

S&S Cycle 635 H.O. Cam Kit For Harley Twin Cam 2007-2017

Item: P274840
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S&S has been in the business of making Harley-Davidson motorcycles go fast for a very long time, and their innovation in the world of bumpsticks is no… Read More

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Product Details

This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S 635 H.O. Cam Kit For Harley Twin Cam


  • Comes with camshafts and inner and outer gears, this is a complete kit
  • Fuel injection tuning required
  • Pinion shaft run-out must be checked before installing S&S Cycle gear drive cams
  • A hydraulic press and other professional tools are required to install S&S Cycle gear drive cams. Additionally, material must be removed from the inner surface of the stock gear cover
  • The stock crankcase may require clearancing for S&S Cycle .625", .640", and .675" lift cams
  • S&S Cycle recommends that gear drive cams be installed by a professional mechanic
  • Due to the inherent characteristics of gear drives, you may experience more valve train noise with gear driven cams
  • Oversized and undersized gears are available to help achieve correct gear lash
  • S&S Cycle have found that with 160 lb. of valve seat force, the S&S Cycle gear drive cams will perform well up to 6200 rpm
  • If higher rpm is anticipated, valve springs that provide higher seat force should be used
  • Camshafts that exceed the limits of the stock valve springs require the use of special high lift springs
  • Most S&S cams have higher lift than stock and are designed to take advantage of the extra flow of ported stock heads or S&S Cycle Super Stock heads
  • Due to the high lift of these cams, S&S Cycle adjustable pushrods are recommended
  • To get the best performance from a performance cam installation, a high flow intake and exhaust system is also recommended
  • Quick installation and Easy Start Cams allow stock starter to start any engine
  • Kit contains cams, gear cover gasket, cam bearings, and instructions
  • 1999-2004 stock springs will handle camshafts with lift up to 0.510". If a camshaft with higher lift is installed, high performance valve springs capable of handling a greater lift must be used
  • 2005-up stock valve springs will handle camshafts with lift up to 0.585"
  • If a camshaft with higher lift is installed, high performance valve springs capable of handling a greater lift must be used. Cams with over 0.585" of lift will cause interference between the valve spring top collar and the valve seal with stock cylinder heads
  • Installation of S&S chain drive cams requires special tools. Attempting the cam change operation without these tools will be difficult
  • Damage can result which will not be covered under warranty
  • 635 camshafts are High lift cams for modified engines with 106" or greater displacement and compression ratios between 10.0:1 and 11.0:1. Works well with stock, un-ported heads, but S&S CNC ported heads are recommended. Best power from 3000-6000 rpm
  • This is not a bolt-in cam set. High-lift springs and clearance checks are required
Made in the USA
Product Style J&P Cycles Item # Catalog Number Store Sku MFR. Product # Availability
Product Style Chain Drive Cams J&P Cycles Item #960734 Catalog Number990-988 Store Sku MFR. Product #330-0328 AvailabilityIn Stock: Ships in 1-2 business days
Product Style Gear Drive Cams J&P Cycles Item #960736 Catalog Number990-990 Store Sku MFR. Product #330-0335 AvailabilityOnly 1 Left: Ships in 1-2 business days
This product is vehicle specific.
Select a vehicle to ensure fitment.
Fitment Notes & Exceptions
  • Installer must check for coil bind, valve-to-valve clearance, and valve-to-piston clearance
  • Due to inherent characteristics of gear-driven cams, you may experience greater valve train noise
  • Material must be removed from the inner surface of the stock gear cover to install S&S gear drive cams
  • Cam bearings and gaskets must be replaced when installing new cams
This Product Fits
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