Computer Numerical Control (CNC) from 8620 billet steel and case hardenDesigned and dyno proven in the USAEngineered by using valvetrain softwareAdds a 5%-10% power gainSelect cams feature Hot Cams Improved Throttle Design (I.T.R.) technology these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-endDesigned for mid to top end gains.Engineered to be drop in cams that use stock valve springs (unless otherwise noted).