Abstract: The present invention relates to an internal-combustion engine, particularly an engine that operates according to the Otto cycle or to the Diesel cycle, comprising at least one cylinder head (1) having at least one valve cap (3), the cylinder head (1) and the valve cap (3) defining at least one through bore (2) for positioning at least one injector (5), additionally comprising at least one injector support positioned inside the through bore (2), the support (4) cooperating with the cylinder head (1) and the valve cap (3) and enabling the positioning of the injector (5). The present invention further relates to a cylinder head (1) and to the injector support (4).