The valve train contains all of the

engine parts

required to open and close the valves in the combustion cylinders, such as the camshaft, valves, pushrods and springs. The valve system of a car engine is responsible for fuel intake into the engine, its compression, ignition and expulsion.
The valve train must be kept in good working order to ensure the engine runs smoothly and efficiently. Mistimed valve openings can affect the performance of the vehicle and damage the engine. If you are planning to replace the valve train, there is a great choice of valve trains for any car available at Eurocarparts.com