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The GM LS3 engine is a 6.2-liter small-block V8 that became iconic for its blend of reliability, power, and modern efficiency. Factory-rated around 430 horsepower and 424 lb-ft of torque in many applications, it delivers strong performance while remaining street-friendly. Featuring an aluminum block and heads, the LS3 uses a single cam-in-block layout with hydraulic roller lifters, maintaining the classic pushrod simplicity that GM small-blocks are known for. High-flow rectangular-port heads, a 10.7:1 compression ratio, and a revised intake manifold help the LS3 breathe efficiently and rev eagerly. It was originally found in performance cars like the Chevrolet Corvette, Camaro SS, and Pontiac G8 GXP, but its popularity quickly spread to the aftermarket. Engine swap enthusiasts love the LS3 engine for its compact size, lightweight construction, and massive parts support.