SBC SHP Iron Block 9.025 4.125/400

The SBC SHP Iron Block 9.025 4.125/400 from DART is a purpose-built bare engine block engineered for small-block Chevrolet applications demanding serious performance and durability. This cast-iron block serves as the foundation for builds ranging from street machines to competition engines, offering the robust construction required when boost, nitrous, or high-RPM demands exceed stock block tolerances.

DART's SHP (Super High Performance) designation means this block features reinforced main webs, optimized water passages, and nodular iron construction that resists flex and deformation under load—critical for forced-induction or high-compression applications where traditional blocks show weakness. The 9.025-inch deck height accommodates modern stroker combinations and allows custom piston-to-deck clearance tuning, while the 4.125-inch bore paired with the 400 cubic-inch displacement spec provides a proven platform for substantial power without requiring exotic cylinder wall thickness or overbore concerns.

At 178 pounds, the block's mass reflects the material density and structural mass necessary for long-term reliability at elevated boost levels or sustained RPM. Builders selecting this block prioritize reliability and resale value over marginal gains, making it an ideal choice for those looking to build a vintage muscle car restomod, a weekend drag racer, or a street rod with modern power.