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 See Page 6-75 For Gear Drive Kits Description Part # Drive Installation Kit 66017 Gear Drive Cam Kits Duration Valve Lift @ Application Grind Timing .053 .020 Lift TDC Springs Part # Specially designed for 88 to 103 engines with 54HG 16/42 238 273 .555 .165 Stock 66990 compression ratio up to 10:1. 43/15 238 273 .555 .158 (2200-5600 RPM). Designed for easy installation in 88 to 103 inch motors 50HG 20/48 248 283 .510 .184 Stock 66991 with stock heads and 9.5 to 9.8 compression ratio. 54/18 252 287 .510 .168 (2400 to 6000 RPM). Great cam for 95 - 103 engines with 9.8-10.2 55HG 22/46 248 283 .550 .197 Stock 66992 compression ratio. Max horsepower - torque at mid 52/20 252 292 .550 .181 and upper RPM’s. (2600-6200 RPM) • Reduced maintenance (no plastic chain guides or tension shoes to wear and contaminate engine oil or clog oil passages). • Cam timing remains constant. All drive and cam gears utilize a light press fit (gear lash), thus eliminating any chain stretch. • Bearing loads are reduced. No chain tensioners are used which can rob horsepower. • Critical sprocket alignment is unnecessary. • To ease installation and eliminate the need to remove fuel tank and rocker covers, use our adjustable pushrods found on 6-55/58 . • Includes instructions. Required Kit for Gear Drive Cams GEAR DRIVE CAM KITS FOR TWIN CAM 2007/LATER & 2006 DYNA MODELS Not legal for sale or use in California
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