The McCormick 3540855M91 valve stem is a genuine OEM component designed for optimal performance in a wide range of agricultural machinery, including various Massey Ferguson, Landini, and McCormick tractor models. This critical engine part ensures the correct sealing and movement of the engine valves, contributing to efficient combustion and engine longevity. With a length of 95 mm, a head diameter of 35.5 mm, and a stem diameter of 9.5 mm, this valve stem is manufactured to exact specifications, weighing 0.12 kg. It is an essential replacement part for maintaining the integrity and reliability of your tractor's engine.