S&S 510 Cam For Harley Big Twin Evo Features: Bolt-in cam that works well with stock or ported heads Improved ramp design results in fairly low valve train noise Designed for engines up to 96 and compression ratios up to 10:1 3000 Rpm-5000 RPM Intake open/close 20/38 Exhaust open/close 52/20 Intake duration 238 Exhaust duration 252 Lift .510 510V Cam Info: Bolt-in cam that works well with stock or ported heads Improved ramp design results in fairly low valve train noise Designed for engines up to 96 and compression ratios up to 10:1 3000 Rpm-5000 RPM Intake open/close 20/38 Exhaust open/close 52/20 Intake duration 238 Exhaust duration 252 Lift .510