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Because LS components can be used on the LSX blocks, the "x" has become the factor that links all LS and LSX engines into the same family. The LS reference covers the many series including LS1/LS6, LS2/L76/L77, LS3/L99, LS4 LS7, LS9, LSA. The LS engine platforms starts with aluminum blocks on all but the Gen III and Gen IV 6.0L and were used in vehicle productions.
LSX Bowtie Block (standard and tall-deck): Introduced in 2007, the LSX Bowtie Block was introduced as GM's race version of the LS engine and boasts of a durable and affordable cast iron casting that was designed to support extreme high-performance combinations including turbos and superchargers.