6.0L Gen III Cast-Iron Engine Block

The GM 12733807 is a 6.0L Gen III cast-iron engine block, serving as a robust foundation for high-performance engine builds. It is designed as a direct replacement for production LQ4 and LQ9 engines, offering the durability and strength required for demanding applications. Key features include a production cast-iron construction for exceptional durability, a production oiling system for reliable lubrication of critical components, and secure 6-bolt iron main bearing caps to ensure superior crankshaft stability, which is crucial for high-horsepower builds. The block has a 4.000" bore and a 9.240" deck height, providing flexibility for various piston and rod combinations. This engine block does not have provisions for Active Fuel Management, making it ideal for high-output performance engines. It is engineered to reliably support over 500 horsepower, positioning it as a go-to choice for enthusiasts aiming to maximize power output without compromising reliability. Whether constructing a street performance vehicle or a dedicated race machine, the GM 12733807 block offers a solid and dependable starting point.