ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-79 1 2 3 4 5 6 7 8 9 10 11 CONTENTS ELECTRICAL FRAME FRONT END CONTROL WHEEL ENGINE DRIVE TRAIN FUEL EXHAUST GENERAL REFERENCE Cams CAM AND GEAR SETS FOR SPORTSTER • Camshaft upgrade is the most logical step after air filter, exhaust, carburetor and ignition system improvements have been made. • Camshaft change will improve mid and upper end power. • All camshafts listed are ground with stock size base circle. • Can be used with stock push rods. • Instructions included. Fits Evolution Sportster 1986/Later Special Power Cam Model Description Requirements Range Grind Year Part # Street 900/1000: Great mid-range and bolt-in 2000/7000 1957/1970 66882 upper end power. Needs 9:1 or higher RPM Y compression ratio for best results. 1971/1980 66883 No head work needed for installation. Lobe Cam Valve Duration Duration Valve Overlap Lobe Separation TDC Lift Grind Timing @ .053” @ .020” Lift @ .053” Centerline Angle at Valve Q stock 10/32 222 262 .400 17 101 102.5 .114 (76/85) 35/07 222 262 .380 104 .114 Y 35/47 262 310 .425 64 96 99 .206 53/29 262 310 .425 102 .182 Special Power Cam Model Description Requirements Range Grind Year Part # For stock 883cc, 1100cc or 1200cc engines More duration and. bolt-in 2000/6000 V2 1986/1990 66891 lift means extra power. Stock springs and lifters can be used. RPM N2 1991/1999 66892 N2 2000/Later 66844 Street/Drags: stock or modified 883cc, 1100cc or1200cc valve/spring 2000/6000 N4 2000/Later 66845 engines. Results in slightly higher idle speed. clearance RPM Modified 1100cc, 1200cc, stroked 883cc & with stock springs and valve/spring 2000/6500 N8 1991/1999 66896 hydraulic lifters. Great mid-range power. clearance RPM N8 2000/Later 66846 Cam Valve Duration Duration Valve Lobe TDC Lift Grind Timing* @ .053” @ .020” Lift Centerline at Valve D Stock 02/41 223 270 .458 109.5 .094 (88-91) 41/02 223 270 .458 109.5 .094 V2 22/38 240 290 .465 98 .180 N2 46/18 244 290 .440 104 .155 N4 30/46 256 296 .490 98 .216 52/24 256 296 .490 104 .189 N8 32/44 256 296 .490 96 .226 56/28 264 302 .500 104 .212 (*) timing listed for .053” lift figures. Cam Specifications - with stock 1.43:1 rocker arm ratio Cam Specifications - with stock 1.625:1 rocker arm ratio Fits Ironhead Sportster 1957/1980
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