Abstract: This invention relates to a fatigue test bench for engine cylinder heads, particularly for motor vehicles. This bench comprises as main elements: a device for fixing the test cylinder head on an intermediate connecting member, connecting it to the means of establishing hydraulic pressure in the combustion chambers and in the circulating of the heat bearing fluids; a pressure generating device which simulates as faithfully as possible and in a reproducible manner the pressure cycle as a function of time in the combustion chambers; and a system of circulating heat bearing fluids through the water chambers of the cylinder head with two differnt circuits, one at ambient temperature and the other at a higher temperature used alternately by means of a regulable timing device which controls the operation of one or other of the circuits.