The small-block Chevrolet (SBC) V8 has undergone several refinements over the decades since its creation. While every true SBC generation uses the same 4.40-inch cylinder bore spacing, single camshaft, and pushrod-driven valvetrain, few specimens rival the popularity of the fourth-generation LS engine lineup. However, the similarities with Gen III LS engines, including their lightweight aluminum engine block and cylinder head construction, make them popular as well. The two most popular and powerful naturally aspirated Gen IV LS engines are
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