LSX Cast Iron Block - 4.185 Bore Finished

The LSX Cast Iron Block - 4.185 Bore Finished is engineered by Chevrolet Performance to serve as a robust foundation for serious LS engine builds. This block is designed for builders and enthusiasts who prioritize durability and precision in high-performance, street, and race applications. It is particularly suited for those constructing stroker engines or upgrading boost capacity.

Constructed from ductile iron, this LSX block features a 4.185-inch bore that is finished to tight tolerances, ensuring compatibility with modern piston and ring packages. The finished bore eliminates machining variability, which is crucial for maintaining concentricity and wall thickness consistency across all cylinder walls. This design is essential for achieving proper ring seal, reducing blow-by, and enhancing engine longevity.

Builders working with LS1, LS2, LS3, and derivative platforms will benefit from this finished component, which is ready for final assembly without the need for additional honing or boring. The block's weight of 268 pounds provides sufficient mass for superior heat dissipation and vibration dampening, making it an excellent choice for high-performance applications.