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What Role Does Cylinder Head Have in the Car Engine? - Zara Techs The cylinder head is a part of the engine, also known as the mechanical control centre of the engine. Cylinder heads seal the top of the cylinder that contains coolant and oils. The cylinder of the engine is the meeting point where ignition occurs. Cylinder heads are made from aluminium or cast iron. However, aluminium is expensive to produce. You can search for the cylinder head services near me to get your fuel system checked