BLOX Racing Tuner Series camshafts are designed and manufactured using OEM-spec, chill-cast camshaft cores. Tuner 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. Tuner Series HSL Cam Specs INTAKE: 255° / 0.496”  EXHAUST: 256° / 0.494” Installation Guide / Product Spec Sheet

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