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The cylinder head is a smaller block that (generally) sits on the top of the crankcase. It is the part of the engine where air is received and mixed with fuel, then passed into the block for the intake/compression/combustion cycle and then directs it out on the exhaust cycle. On OHC/OHV (OverHead Cam/OverHead Valve) engines, the cylinder head contains, at least, - with many more possibilities - the intake and exhaust valves (one or more of each per cylinder), the camshaft(s), either a belt or chain for timing the cams and valves to the movement of the pistons, fuel injectors (if present), and various types of apparatus to operate the opening and closing of the valves including mechanical or hydraulic systems for valve movement and sensors such as a MAF (Mass Air Flow), PCV (Portioning Control Valve), and/or EGR (Exhaust Gas Recirculation) valve.

The head gasket is the gasket that goes between the cylinder head and the crankcase or block of the engine.

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15y ago

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