Pair Camshaft Intake Rocker Arm for Polaris Sportsman 500 450 400 Magnum 500 Ranger 500 400 2x4 4x4 52801255Introductions: Camshafts are used in internal combustion engines (to operate the intake and exhaust valves). Camshafts in automobiles are made from steel or cast iron, and are a key factor in determining the RPM range of an engine's power band. Features: 100% Brand new. High performance aftermarket parts. Built to strict quality control standards. Specification Application: for Polaris SPORTSMAN 500 2x4 4x4 6x6 1996~2012 for Polaris SPORTSMAN 450 4x4