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When designing a cylinder head for two families of stationary diesel engines, air cooled, direct injection, to consider these issues: the BMEP, which is limited to these engines to value 3.8-5.2 bar. To optimize gases exchange process and obtain a desired swirl number, different solutions are studied geometry galleries, speed location of valves and gas fields developed in the process for each proposed solution. The paper presents the optimal solution found in the following constructive analysis made for a program Fluent single cylinder engine and one engine family bi-cylinder mentioned, looking at for each case of cooling air flow. Another aspect to be taken into account when designing the cylinder heads is to determine the thermal regimes of the cylinder head, piston, cylinder, valve and nozzle, in order to define the development of heat per cycle. From our experience in designing and attempts stationary air cooled engines and the development of injectors and new combustion chambers, a combustion code, written in C++, I simulate the heat release rate per cycle serving to define data plating to determine required heat transfer. The objectives of this paper are to define an optimum construction solutions for a cylinder head for two families of air-cooled diesel engine with direct injection, having the stroke of 65 and 80 mm for 82 mm bore. [ABSTRACT FROM AUTHOR]