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 gainDesigned for peak top end horsepowerEngineered to be drop in cams that use stock valve springs (unless otherwise noted).Select 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-end.