A-B1690972-AI ARM-ROCKEROne New Aftermarket Replacement Rocker Arm Fits Briggs & Fits Stratton Small Engines This aftermarket replacement rocker arm Fits Briggs & Fits Stratton (B&S) small engines and is a key valvetrain component that converts the rotational motion of the camshaft into the linear motion required to open and close the engine's intake and exhaust valves. It is commonly used in snow blower engines including the Fits Briggs & Fits Stratton 1450 Snow Series.