BRAND NEW PART # 288121 Andrews TW21 21 Series Chain Drive Grind Cams Kit Fits Harley 1999-2006 Twin Cam Models (EXCEPT 2006 DYNA GLIDE) Andrews Products grinds its cams with the help of a computer with cam design capabilities. This superior technology gives the utmost in both performance and reliability. Only the best alloy steel billets and heat-treating processes are utilized. Furthermore, the power in Harley’s Twin Cam engine can be made even more convincing when superior Andrews computer-designed high-performance cams are installed. Cams work well with fuel injection or carburetor models Run best with low restriction exhausts (1700-5200 rpm) Bolt-in cam for more torque with stock compression Can be used with stock valve springs and tappets Similar to the EV-23 cam Chain Driven Cams: 00-06 model cams use a splined cam drive sprocket. These cams will fit in the 1999 Twin Cam motor, but the splined cam drive sprocket OEM #25716-99 or DS-199175 must be used. Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance. 59G, 60G and 64G cams are for highly tuned engines and require the knowledge of an expert engine builder for proper setup and installation. Notes: Runs best with low restriction exhausts (1700-5200 RPM) Can be used with stock valve springs and tappets Grind: 21 Series Intake Lift at TDC: 0,134″ Intake Open: 10 Intake Lobe Centerline: 100 Intake Close: 30 Intake Lift: 0,498″ Intake Duration: 255 Exhaust Lift: 0,498″ Exhaust Duration: 264 Exhaust Lift at TDC: 0,121″ Exhaust Open: 41 Exhaust Lobe Centerline: 106 Exhaust Close: 8