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The Chrysler Hemi engine, known by the trademark Hemi or HEMI, refers to a series of high-performance American overhead valve V8 engines built by Chrysler with hemispherical combustion chambers. Three generations have been produced: the FirePower series (with displacements from 241 cu in (3.9 L) to 392 cu in (6.4 L)) from 1951 to 1958;[1] a famed 426 cu in (7.0 L) race and street engine from 1964-1971; and family of advanced Hemis (displacing between 5.7 L (348 cu in) 6.4 L (391 cu in) from 2003 to 2024.
Although Chrysler is most identified with the use of "Hemi" as a marketing term, many other auto manufacturers have incorporated similar cylinder head designs. The engine block and cylinder heads were cast and manufactured at Indianapolis Foundry.[which?][when?][citation needed]
During the 1970s and 1980s, Chrysler also applied the term Hemi to their Australian-made Hemi-6 Engine, and a 4-cylinder Mitsubishi 2.6L engine installed in various North American market vehicles.