S&amp,S Cycle Chain-Drive Cam Kit 330-0016 For use with stock splined drive gears for installation on 1999 Twin Cam motors you must purchase splined outer drive sprocket S&S recommends that Andrews 4340 steel drive sprocket be used 509 grind cams bolt-in touring cams for 88" engines with stock compression ration Great low and midrange torque 180 psi cranking compression no need for compression releases