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Gaskets and seals are needed in your engine to make the machined
joints snug, and to prevent fluids and gasses (oil, gasoline,
coolant, fuel vapor, exhaust, etc.) from leaking.
The cylinder head has to keep the water in the cooling system at the
same time as it contains the combustion pressure. Gaskets made of
steel, copper and asbestos are used between the cylinder head and
engine block. Because the engine expands and contracts with heating
and cooling, it is easy for joints to leak, so the gaskets have to be
soft and "springy" enough to adapt to expansion and contraction. They
also have to make up for any irregularities in the connecting parts.
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