General Motors has been producing small block V6 and V8 engines since the mid-1950s, and over the last 70 years of their existence, they have been through a great number of changes. The biggest shift came in 1997 with the introduction of the LS family of small block engines, which continue to be what GM uses to this day. There have been a total of three generations of the LS engines, with the current one starting back in 2013.
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