ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-78 1 2 3 4 5 6 7 8 9 10 11 CONTENTS REFERENCE GENERAL EXHAUST FUEL DRIVE TRAIN ENGINE WHEEL CONTROL FRONT END FRAME ELECTRICAL Cam Valve Timing Valve Duration Valve Centerline Lift @ TDC Description Grind Intake Exhaust Intake Exhaust Lift Intake Exhaust Intake Exhaust Part # Big Twin 1999/2006 510G 20˚/38˚ 52˚/20˚ 238˚ 252˚ .510” 99.0˚ 106.0˚ .187” .178” 66972 (except Dyna 2006) 570G 20˚/40˚ 55˚/20˚ 240˚ 255˚ .570” 100.0˚ 107.5˚ .187” .179” 66974 Complete kit. 585G 20˚/45˚ 60˚/20˚ 245˚ 260˚ .585” 102.5˚ 110.0˚ .186” .179” 66975 625G 20˚/55˚ 60˚/20˚ 255˚ 260˚ .625” 107.5˚ 110.0˚ .189” .184” 66976 640G 25˚/60˚ 65˚/25˚ 265˚ 270˚ .640” 107.5˚ 110.0˚ .228” .214” 66977 Big Twin 2007/Later 510G 20˚/38˚ 52˚/20˚ 238˚ 252˚ .510” 99.0˚ 106.0˚ .187” .178” 66979 & Dyna 2006 570G 20˚/40˚ 55˚/20˚ 240˚ 255˚ .570” 100.0˚ 107.5˚ .187” .179” 66981 Complete kit. 585G 20˚/45˚ 60˚/20˚ 245˚ 260˚ .585” 102.5˚ 110.0˚ .186” .179” 66982 625G 20˚/55˚ 60˚/20˚ 255˚ 260˚ .625” 107.5˚ 110.0˚ .189” .184” 66983 640G 25˚/60˚ 65˚/25˚ 265˚ 270˚ .640” 107.5˚ 110.0˚ .228” .214” 66984 Cam & Gear Sets Fits Twin Cam 1999/Later S&S offers a variety of cam grinds for 1999/Later Big Twin gear drive engines. With the exception of the “bolt in” 510G camshafts, S&S cams are high lift and were designed to take advantage of the extra flow of ported stock heads or S&S Super Stock® cylinder heads. Due to the high lift of these cams, S&S adjustable pushrods and high performance valve springs are recommended. The patented S&S Gear Drive Cams are a must in order to achieve the full potential from high performance Harley Davidson® Twin Cam 88® engines. Since the chain drive system used in stock Twin Cam 88 engines is not adequate to accurately control valve action at high RPM when using high lift cams and high performance valve springs, a different system was needed. The S&S Gear Drive System was developed to improve performance and to eliminate potential engine damage caused by failure of the chain and tensioner system. S&S Gear Drive Camshaft kits improve valve timing accuracy by eliminating timing chain lash, as well as variations caused by the loose fitting stock cam drive sprockets. All stock chain drive components are replaced with S&S Gear Drive Cams and outer drive gears. This simple, effective solution reduces power loss by eliminating chain drag, and allows more aggressive cam profiles and increased valve spring force to be used. Application information for S&S® Camshaft fors 1999/Later Big Twins Notes • Pinion shaft runout must be checked before installing S&S Gear Drive Cams. • A hydraulic press and other professional tools are required to install S&S Gear Drive Cams. Additionally, material must be removed from the inner surface of the stock gear cover. The stock crankcase will require clearancing for S&S .625”, .640”, and .675” lift cams. S&S 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. We have found that with 160lbs of valve seat force, the S&S 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. S&S® GEAR DRIVE CAMSHAFT KITS FOR 1999/LATER BIG TWIN ENGINES • 510G: Designed as a bolt in cam for 88”, 95”, and 96” engines with compression ratios below 9.7:1., it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall. • 570G: Designed for 88” to 103” engines with compression ratios between 9:1 and 10:1. This cam will provide a nice power increase across the entire power band. 3200-5700 rpm. Excellent bolt-in for overall power on 103”. • 585G: Designed for 88” to 95” engines with compression ratios from 9.7:1 to 10.5:1 and 100” to 124” engines from 9:1 to 10:1 compression. Provides massive horsepower and torque increases starting at 3000 rpm, and holds steady all the way to redline. 3500-6000 rpm for 88”- 103” engines and 2500-5500 rpm for larger engines. • 625G: Cam set designed for 95” or larger engines with compression ratios between 10.0 and 10.75:1. 3000-6000 rpm. • 640G: Used in S&S T124 engines, this cam makes horsepower! Intended for engines of 95” or more with compression ratios between 10.5:1 and 11.5:1. 3000-6000 rpm. • 675G: A high lift monster, this cam-set is designed for 120” or larger engines with at least 11:1 compression ratio. 4500-6500 rpm. CAM GEAR DRIVE KITS • Includes front and rear inner cam gears, pinion gear, and outer cam gear. • Sold as a kit. Description Part # Big Twin models 1999/2006 (except Dyna 2006) 66021 Big Twin models 2007/2015 & Dyna 2006 66022 Not legal for sale or use in California
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