Is an LS2 a small block Chevy engine?

No, the LS2 is not considered a small block Chevy engine in the traditional sense. It is part of GM's LS engine family, which is a series of V8 engines that evolved from the small block design but features a different architecture. The LS2, specifically, is a 6.0-liter engine introduced in the mid-2000s and is often categorized as a "Gen III" or "Gen IV" engine, distinguishing it from the classic small block engines like the 350 or 327.