What do the heads in a car do?
piston ride up/down in cylinders in the block - the heads are attached to the block. They seal the compression chamber closed, and house/hold the spark plugs, valves, cam shafts (in OHC/overhead cam engines) and complete the water jacket around the engine. Coolant/water flows through the block and heads - why you lose water when you warp a head gasket, water is going into the compression chamber. When you have an OHV/overhead valve engine, on top of the head(s) is/are the valve covers.
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