The cylinder head gasket found in the engine block is a very important part between the top cover of the engine and the engine block. The engine top block contains the valves, camshaft, injectors and spark plugs. The upper part of the combustion chamber is in the engine upper block. Pistons, timing gears, crankshaft, cartel are in the engine block. At the junction of these two blocks, there are combustion chambers. Ignition happens here. Your engine generates power here. The cylinder head gasket is right where these two blocks meet. It prevents oil, water and compression leaks between two blocks. The cylinder head gasket is in contact with oil in one part, water in another part and combustion-fire in the other part. Therefore, the quality of the gasket is very important.