BLOX Racing Competition Series camshafts are designed and manufactured using BLOX Racing’s own chill-cast camshaft cores. The Competition Series cores are cast with wider primary and secondary lobes in order to provide better valvetrin stability at higher RPMs. Competition Series camshafts are a favorite with auto cross and road racers.Competition Series HSL (High Speed Lift) camshafts are ideal for mild to highly modified street engine builds. These are one of the BEST naturally-aspirated camshafts available!Upgraded valvetrain is required.Camshaft SpecificationsINTAKE: 255° / 0.496” EXHAUST: 256° / 0.494”