5.9L 12 Valve Cummins Stage 2 Ported & Polished Cylinder Head (1989-1998) - Industrial Injection - PDM-12VRH

Industrial Injection 5.9L 12 Valve Cummins Stage 2 Ported and Polished Cylinder Head with Fire Ring Grooves ( 1989-1998)
The Industrial Injection Stage 2 Ported and Polished Cylinder Head is designed for 1989-1998 Dodge Ram 5.9L 12 Valve Cummins engines that demand increased airflow, enhanced durability, and superior head gasket sealing. Fully CNC ported and hand-finished, this high-performance cylinder head is built for towing, street performance, drag racing, and sled pulling applications where airflow and reliability are critical.
Featuring an intake shelf machined off to accept a performance intake runner, this Stage 2 cylinder head is optimized for maximum airflow and cylinder efficiency. Advanced CNC porting of both the intake and exhaust ports ensures consistent airflow across every cylinder, while precision hand blending provides a smooth, high-quality finish for improved performance and drivability.
Each cylinder head is assembled with premium stainless steel nitride-coated valves, hardened alloy valve guides, top hat valve seals, and upgraded 150lb valve springs to provide exceptional durability and valve train stability. Radius-cut fire ring grooves are machined into the head to provide enhanced combustion sealing when used with a compatible fire ring head gasket, helping reduce the risk of head gasket failure in high-boost applications.
To further improve reliability, drilled and tapped steel coolant freeze plugs replace the factory press-in plugs, eliminating a common failure point found in OEM cylinder heads. The 7mm injector bore design provides compatibility with popular injector upgrades, making this cylinder head an ideal foundation for both street and competition builds.
Features:
Intake shelf machined off to accept performance intake runner
Fully CNC ported intake and exhaust ports with performance hand blending
Radius-cut fire ring grooves for improved head gasket sealing
Custom performance stainless steel nitride-coated valves
Top hat valve seals
Diamond honed hardened alloy valve guides
Drilled and tapped steel coolant freeze plugs
Upgraded 150lb valve springs
7mm injector bores
Complete and ready for installation
Benefits:
Increased airflow and engine efficiency
Improved horsepower and torque potential
Enhanced combustion sealing for high-boost applications
Increased valve train stability and durability
Reduced risk of freeze plug and head gasket failures
Compatible with performance injector upgrades
Optimized for towing, street performance, sled pulling, and racing applications
Built to withstand higher cylinder pressures and demanding operating conditions
Important Notes:
Fire Ring Head Gasket sold separately.
Performance Intake Runner sold separately.
Why Choose Industrial Injection?
Built using advanced CNC machining technology and premium valvetrain components, the Stage 2 Ported and Polished Cylinder Head delivers the airflow, strength, and reliability needed to support serious horsepower while maintaining the durability that 12 Valve Cummins owners expect.