Head gasket
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In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head.
Head gasket (in dark gray with a red border) sitting on top of an inline-four engine block. When installed, the four large holes will align with the cylinders.
Head gasket with a leak between the rightmost and centre cylinders.
Engine block
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In an internal combustion engine, the engine block is the structure that contains the cylinders and other components. The engine block in an early automotive engine consisted of just the cylinder bloc
Head gasket
…In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head(s). Its purpose is to seal the combustion gases within the cylinders and to avoid coolant or engine oil leaking into the cylinders…
Block of a modern V6 diesel engine with dry liners. The large holes are the cylinders, the small round orifices are mounting holes, and the small oval orifices adjacent to the cylinders are coolant or oil ducts.
Marine engine with cylinders cast in three pairs
Cylinders cast in two blocks of three
Cylinders cast in a single block of six, with an integrated crankcase (turbocharger in background)