5.9 Cummins 12 Valve Stage 1 Ported & Polished Cylinder Head (1989-1998) - Industrial Injection - PDM-12VSTH

1989-1998 5.9L Cummins 12 Valve Stage 1 Ported and Polished Cylinder Head with Fire Ring Grooves
The Industrial Injection Stage 1 Ported and Polished Cylinder Head with Fire Ring Grooves is engineered for 1989-1998 Dodge Ram 5.9L 12 Valve Cummins engines seeking improved airflow, enhanced durability, and superior head gasket sealing. Utilizing advanced CNC porting technology and precision hand-finishing, this cylinder head delivers increased airflow and performance while maintaining the reliability needed for daily driving, towing, and high-horsepower applications.
Each cylinder head is CNC ported and hand blended to ensure consistent airflow across every cylinder. The 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 control.
For added reliability, the cylinder head features drilled and tapped coolant freeze plugs, eliminating a common failure point found in factory cylinder heads. Radius-cut fire ring grooves are machined into the head to provide improved combustion sealing when used with a compatible fire ring head gasket, helping reduce the risk of head gasket failure under increased cylinder pressures.
The 7mm injector bore design offers compatibility with popular injector upgrades, making this cylinder head an ideal choice for street, towing, and performance-focused 12 Valve Cummins builds.
Features:
CNC ported cylinder head 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 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
Greater valve train stability and reliability
Reduced risk of freeze plug and head gasket failures
Compatible with performance injector upgrades
Ideal for towing, street, and competition builds
Applications:
1989-1998 Dodge Ram 2500/3500 5.9L 12 Valve Cummins Engines
Important Note:
Fire Ring Head Gasket sold separately.