General Motors LS-based small-block engine

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The General Motors LS-based small-block engines are a family of V8 and offshoot V6 engines designed and manufactured by the American automotive company General Motors. Introduced in 1997, the family is a continuation of the earlier first- and second-generation Chevrolet small-block engine, of which over 100 million have been produced and is also considered one of the most popular V8 engines ever. The LS family spans the third, fourth, and fifth generations of the small-block engines, with a sixth generation expected to enter production soon. Various small-block V8s were and still are available as crate engines. The "LS" nomenclature originally came from the Regular Production Option (RPO) code LS1, assigned to the first engine in the Gen III engine series. The LS nickname has since been used to refer generally to all Gen III and IV engines, but that practice can be misleading, since not all engine RPO codes in those generations begin with LS. Likewise, although Gen V engines are generally...

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