ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-68 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 Cams & Cam Drive Sprocket Kits CAMS FOR BIG TWIN EVOLUTION ALL YEARS S&S Cam Specifications For 1984/1999 Big Twin Evolution Valve Timing Spring Tappet Cam Open/Close Valve Duration Valve Lift @ TDC Spacing Type Name Intake Exhaust Intake Exhaust Lift Intake Exhaust Required Required Part # 508 11O/25O 50O/5O 217O 235O .508” .141” .110” No Hydraulic 66833 510V 20O/38O 52O/20O 238O 252O .510” .187” .178” No Hydraulic 66834 561 32O/40O 50O/26O 252O 256O .560” .252” .210” Yes Hydraulic 66835 585V 20O/45O 60O/20O 245O 260O .585” .186” .180” Yes Hydraulic 66836 600 20O/55O 60O/20O 255O 260O .600” .192” .184” Yes Hydraulic 66837 Timing designation is function of zero lash @ .053” off base circle. Lifts @ TDC are measured at the valve and are for reference only. Overlap valve lifts must be checked on assembled motors. Bottom curves: 80” Harley-Davidson® Evolution® with stock cams. Middle curve: 80” Harley-Davidson® Evolution® with S&S 508 bolt-in cams. Top curve: 80” Harley-Davidson® Evolution® with S&S 508 bolt-in cams.All dyno runs uaed the same high flow intake and exhaust system. Results typical with all Big Twin engines. Application 508 Cam - Bolt-in cam intended for stock engines with less than 10:1 compression ratio. Quiet valve train with excellent low/mid range torque for touring and 2 up riding. 510V Cam - Bolt-in cam that works well with stock or ported heads. Improved ramp design results in low valve train noise. Meant for engines up to 96” and 10:1 compression ratio. 3000-5000 rpm. 561 Cam - For 80”-96” engines at 9.5:1-10.5:1 compression ratio. Provides strong midrange power. 3000-5500 rpm. 585V Cam - A versatile cam for 80”-96” engines with 10:1-10.5:1 compression, and larger engines with 9.5:1-10: compression ratios. 3500-6000 rpm. 600 Cam - An exceptional cam in any large displacement engine with 9.5:1 to 10.5:1 compression. 3500-6000 rpm. Fits Big Twin Evolution 1984/1999 66096 66010 Andrews heat treated steel cam drive sprockets are an upgrade for rear camshafts on engines with silent chain cam drives. Kit includes three spacer shims and one grade 8 bolt and hardened washer. New sprockets can be set up to the same length specs as original stock sprockets. If you’re into performance with an 88 engine and silent chains, steel sprockets are a must, even with stock camshafts. TWIN CAM DRIVE SPROCKET KITS (1999 STYLE CHAIN DRIVE) OUTER CAM BEARING KIT FOR TWIN CAM Description Part # 34 Tooth Splined Cam Sproket Kit 66096 17 Tooth Steel Crank Sproket 66010 • Use this top quality outer cam bearing kit when you replace or service cam shafts. • See Section 10 for camshaft service tools. Fits Twin Cam 1999/2006 except Dyna 2006 (Rpls. HD 8983 & 8990A`) Part 66940 Not legal for sale or use in California
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