LSX Cast Iron Block - Semi Finish 9.260 DH

The LSX Cast Iron Block - Semi Finish 9.260 DH is the foundation for serious high-performance LS engine builds. Engineered by Chevrolet Performance for professional builders, mechanics, and enthusiasts who demand reliability under extreme conditions, this semi-finished cast iron block delivers the structural integrity required for turbocharged, supercharged, and naturally aspirated applications. Whether you're building a track-focused engine or a street powerplant rated for 500+ horsepower, this block provides the core platform trusted across law enforcement pursuit vehicles, military contractor vehicles, and competitive motorsports operations.

This LSX block features a 3.880-inch bore diameter and a 9.260-inch deck height, paired with six-bolt main bearing caps for maximum crankshaft security during high-load acceleration and sustained high-RPM operation. The semi-finished condition means critical surfaces are precision-machined to exacting tolerances, while secondary surfaces retain the original casting finish—reducing cost while maintaining the dimensional accuracy that separates a reliable engine from a catastrophic failure. Cast in ductile iron, the block resists cracking under thermal cycling and mechanical stress, essential for military and tactical vehicle applications where durability cannot be compromised. The iconic orange powder coat finish provides corrosion resistance and is instantly recognizable as Chevrolet Performance factory-spec quality.

This block is ideal for builders who understand that a quality foundation prevents catastrophic in-service failures. The 9.260-inch deck accommodates standard LS cylinder heads and is compatible with LS1, LS2, LS3, LS7, and LSX variants, offering unprecedented flexibility in component selection and future upgrades. Installers should verify that machine work aligns with their intended application—supercharged and turbocharged builds may require additional reinforcement or piston selection to account for boost pressure. At 250 pounds, handling requires proper engine stand preparation and mechanical support; do not attempt installation without certified lifting equipment rated for mid-sized engine blocks.