S&S Cycle S&S 510V Cams for Harley Davidson 1984-99 Evo Big Twin Models Manufacturer Part No: 33-5124 For engines up to 93in. with no greater than 10:1 compression Bolts-in and works with stock or ported heads - about a 10 horsepower gain over stock Horsepower gains similar to S&S 502 cam but better low and midrange torque Improved ramp design for quieter operation