Abstract: A process is disclosed for the production of cast cylinder heads made of aluminium alloys from at least two different "liquid" alloys. The liquid alloys at the time of casting may contain solid particles of varied size and shape so as to produce composites with a metal matrix after solidifying. The process for moulding composite cylinder heads includes a number of successive layers consisting of at least two different alloys and consists in casting each alloy layer in the cavity of a mould via a feed system with a waiting time between the end of casting of one layer and the beginning of the second layer, so that the first layer contains between 50 and 100% of solid fraction in its lower part and 0 to 80% of solid fraction in the upper part, the interface region, when the second alloy is introduced.