The cylinder head is the upper, closing element of internal combustion engines. It is located above the cylinders on the engine block, thus delimiting the combustion chamber. There is a cylinder head seal between the cylinder head and the block, which provides compression. There are many components in the cylinder head, which are: valve guides, precombustion chambers, injector sleeves, cylinder head bolts, valves, valve seats, valve springs, valve discs, spring plates. Also located here are camshafts, camshaft bearings, camshaft housing, camshaft bearing bush, insert, valve lifter, rocker arm, rocker arm shaft. The components here must be sealed together with different seals to prevent the coolant and engine oil from mixing. These seals are valve stem oil seals and camshaft oil seals. The function of the cylinder head is to close the combustion chamber from above, to enclose the control elements, the atomizer or the spark plug. The cylinder heads are subjected to high pressure and thermal stress. Cooling the cylinder head with air or coolant is a serious task. Air cooling is simpler, but due to its many disadvantages, liquid cooling is mainly used. A-M cylinder heads are made of cast aluminum or cast iron. For both feedstocks, there is a direct injection or pre-chamber, i.e. indirect injection, system. In the case of direct injection, the vortex chamber is formed in the piston roof.