The Engine Rocker Arm is a genuine GM part designed specifically for vehicles with VIN code C and engine code L83. This high-quality rocker arm ensures proper valve operation and performance, making it a crucial component for maintaining the engine's efficiency and power output. Made by GM Genuine Parts, it is a reliable and durable part that meets the standards set by General Motors for quality and performance. Perfect for those looking to replace their existing rocker arm with a trusted and compatible option.