This OEM heavy-duty engine cylinder block is designed specifically for Isuzu NRR, NQR, NPR, and NPR-HD trucks from 2004-2009 with the 4HK1 5.2L engine. Precision-engineered with four cylinder bores and robust construction, this block serves as the foundational component of your engine rebuild. The black-finished block features strategically placed mounting points, oil passages, and reinforced walls to ensure optimal performance and durability. Perfect for professional mechanics and fleet maintenance operations, this cylinder block is backed by a 1-year manufacturer warranty. Each unit undergoes strict quality control to ensure proper fitment and function for your specific vehicle application. Professional installation is strongly recommended to ensure proper engine assembly and performance.