Unfinished cylinder head casting, cast cylinder head for diesel internal combustion engines, and process for producing an unfinished cylinder head casting

Unfinished cylinder head casting for producing a cylinder head for internal combustion engines powered with diesel fuel, the unfinished cylinder head casting comprising:

• a sealing surface for mounting the unfinished cylinder head casting in a finished state on a corresponding sealing surface of an engine block, the sealing surface including a combustion chamber region, the combustion chamber region associated with a combustion chamber formed in the engine block;
• and
• a sealing surface section, the sealing surface being positioned on the sealing surface section of the unfinished cylinder head casting, the sealing surface section having a thickness in a casting state including a first machining allowance in relation to a set thickness obtained after a material-removing finishing of the sealing surface, wherein within at least a portion of the combustion chamber region a second machining allowance of the sealing surface section amounts to a maximum of 15% of the first machining allowance of the sealing surface section.