Engine Block

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The cylinder block, fundamental to reciprocating engines, is a unified assembly containing the cylinders and possibly additional surrounding parts like coolant channels, intake and exhaust pathways, and ports. Sometimes, it incorporates the crankcase too; in such cases, it's referred to as an engine block. Despite this, "engine block" and "cylinder block" are often used interchangeably, although technically, they can denote distinct levels of integration within the engine design.