The Cleveland engine family refers to a series of V8 engines produced by Ford Motor Company from the late 1960s to the early 1980s. These engines were designed for high performance and were used in various Ford and Mercury vehicles. The Cleveland engines are known for their unique design features, including a large intake manifold and high-flow cylinder heads, which contributed to their power output. The most notable variants of the Cleveland engine family include the 351 Cleveland and the 400 cubic inch engine. These engines were popular in muscle cars and performance vehicles of the era, making them a significant part of American automotive history. Their legacy continues to influence engine design and performance tuning today.