514 Series Cam - Big TwinCaracteristicas: S&S cams are tested on the dyno, street and racetrack before being offered to the public With hundreds of test hours on them, you know that you are getting the best cam S&S can produce Recommend high performance hydraulic or solid lifters For lower compression motors, not more than 9: 1 Best response from 2500 to 5000 rpm Installer must check coil bind, valve to valve clearance, valve to piston clearance and cam lobe to case