The LS Series cylinder block is the foundation for the serious performance achievements that are driving a new generation of street and racing enthusiasts. Features include a deep-skirt casting (the block side extends below the crankshaft centerline); 6-bolt cross-bolted main caps, strong and lightweight aluminum alloy casting (most productioin blocks) and provisions for the latest in engine control management. The cam-in-block configuration brings inherent torque to every LS engine, with production-based blocks capable of supporting combinations of 500 horsepower or more. The corvette ZR1’sunique 6.2L block, for example, supports the engine’s 638-horsepower rating. GM Performance Parts’ high-performance inon LSX cylinder block supports more than 2000 forced-inductioni horses!