Abstract: A cooling jacket casting core for the production of a cylinder head of an internal combustion engine. The cooling jacket casting core has a slot running at least in part substantially in the direction of a crankshaft longitudinal axis and separating the cooling jacket casting core in at least one section. The slot can run at least in part in an impression of the cooling jacket and can have at least one elevation arranged perpendicular to the longitudinal axis of the cooling jacket casting core.

Abstract: A cooling jacket casting core according to the invention for the production of a cylinder head of an internal combustion engine comprises at least one impression of a cooling jacket. The cooling jacket casting core itself has a slot running at least in part substantially in the direction of a crankshaft longitudinal axis and separating the cooling jacket casting core in at least one section. In accordance with a further development, the slot runs at least in part in the impression of the cooling jacket. The slot preferably has at least approximately one elevation arranged perpendicular to the longitudinal axis of the cooling jacket casting core. This longitudinal extension of the slot runs parallel to a crankshaft associated with the cylinder head in an internal combustion engine.