ANDREWS - 59 SERIES CAMS FOR TWIN CAM Andrews Products grinds its cams using computer-aided 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 used. The power in a Harley Twin Cam engine is completely released only when superior Andrews computer-designed high-performance cams are installed. Can be installed on both carbureted and fuel injected models.