Abstract: In a cylinder head for internal combustion engines, the engine having a longitudinal axis and intake and exhaust ports, the head including at least one concave portion defining a curved wall of a combustion chamber, the combustion chamber being provided with at least two spark plugs, the improvement comprising, providing in the cylinder head, a fluid channel means which extends into a cone-like projection for cooling the central part of the combustion chamber. The cone-like projection is located between the spark plugs and extends into the combustion chamber.