Stage 4 Extreme Street/Race Port Induction 24v Cylinder Head for 6.4L & 6.7L Cummins

Upgrade your race truck with this 6.4L or 6.7L Cummins with a PDD Stage 4 Race Ported 24v head.  These cylinder heads are engineered for competition use and are designed to take your 6.4L or 6.7L Cummins to the next level. This Stage 4 Cylinder Head includes a Kingspeed billet intake shelf.

Professional installation is required. Installation error is not covered under warranty.

Key Features

• Induction-Hardened Valve Seats: Integrated seats eliminate the chance of a dropped seat, ensuring reliability under extreme conditions. 

• Stage 4 CNC Porting: Delivers a 60% airflow increase, achieving 272 CFM intake flow and 248 CFM exhaust flow for superior performance and reduced exhaust gas temperatures (EGT).

• Oversized 36mm (1.42") Inconel Intake Valves and 34mm (1.34") Inconel Exhaust Valves eliminate tuliped valves that plague this industry (Minimum 4.125" bore size required)

• CNC-Cut Fire-Ring Grooves: Optional precision-machined 4.550″ grooves enhance sealing for high-horsepower applications.

• Threaded Freeze Plugs: Replace soft factory plugs to eliminate coolant leaks under the valve cover, preventing oil-coolant mixing.

• Superior Construction:

  • Newen CNC Multi-Angle valve job for optimal sealing and class-leading low-lift flow.
    

  • PDD 125# performance valve springs, locks, retainers, and valve seals for milder applications utilizing cast camshafts up to 5,000 RPM. (0.450" maximum lift)

  • Optional upgraded PDD 180# dual valve springs, locks, retainers, and valve seals for extreme applications running 100+ psi boost, up to 7,000 RPM. Extreme spring load may require cam bushings, steel camshaft, and steel lifters (0.525" maximum lift).
    

• Brand New, No Core Required: A fresh cylinder head, ready to install without the need for a core return.

Made to order - Please Call for ETA