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

Features

• 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