Cylinder head for an internal combustion engine with cast breather channel

The cylinder head (10) has an under-surface (12) designed to fit on the engine cylinder block and an upper part (14) designed to be fitted with a cover and a made with a surface (22) to receive a crankcase gas decantation element. The head has an inner channel (32) that is made during casting and shaped to carry crankcase gases from an intake (34) in its under-surface to an outlet (36) aligned with the inlet port of the gas decantation element. The channel (32) is located against one side of the cylinder head to form a stiffening compartment.