Performance Cylinder Head (Stage 1) Dodge/Ram 5.9L Cummins 2003-2007

• 5-Axis CNC Ported for Increased Flow - Intake flow increased from 155 CFM to 220 CFM for improved efficiency and power
• 105-Pound Valve Springs - Enhances valve control to support higher boost and RPM. Factory Intake Plenum Retained - Simplifies installation while maximizing airflow gains
• Upgraded Hardened Valve Seats - Extra-large, heat-resistant seats prevent failure and extend durability
• Precision CNC Valve Job - Optimized for enhanced airflow and performance
• Thoroughly Remanufactured & Pressure Tested - Crack-checked, resurfaced, and assembled to exceed OEM standards
• Direct Bolt-On Replacement - Designed for 2003-2007 Dodge Cummins 5.9L engines
• Fully Assembled for Convenience - Includes new valve seals, soft plugs, and HD springs, ready for installation
• Cylinder heads ordered with the Fire Ring option include a custom-matched Fire Ring gasket

The 2003-2007 5.9 Stage 1 Cummins Performance Cylinder Head is designed to deliver increased airflow and durability without the added cost and complexity of an aftermarket intake. Featuring 105-pound valve springs and a 5-axis CNC port job, this head significantly boosts intake flow from 155 CFM to 220 CFM, improving low-end performance, reducing boost pressure, and lowering EGTs. Built on the foundation of the HP Reman Head, it includes new bronze guides, oversized hardened seats, and a high-performance CNC valve job for enhanced longevity and efficiency. Manufactured by D&J Precision Machine, this cylinder head is a proven upgrade for both stock and performance-driven Cummins builds.