The valvetrain is a crucial component of an internal combustion engine, responsible for controlling the opening and closing of the engine's valves. It consists of several parts, including camshafts, rocker arms, and pushrods, which work together to ensure that air and fuel enter the combustion chamber and exhaust gases exit efficiently. In most engines, the valvetrain operates in sync with the crankshaft, allowing for precise timing of valve movements. This synchronization is essential for optimal engine performance, fuel efficiency, and emissions control. Different engine designs, such as overhead cam or pushrod configurations, influence how the valvetrain is structured and functions.