D&J Precision Performance Cylinder Heads

Product Name: D&J Precision Performance Cylinder Heads
Manufacturer: D&J Precision
Thoroughbred Diesel Part #: DJPPERCYLHEAD
Fitment Notes: Dodge Cummins

D&J Precision CR Stage 1 Cummins Performance Head is a step up in performance without the extra expense and work involved with an aftermarket intake. This head includes everything in our HP Reman Head along with 105-pound valve springs and a 5-axis port job while retaining the factory intake plenum. This increases the flow on the intake from around 155 CFM stock to 220 CFM, enhancing low-end performance, decreasing boost pressure, and lowering EGTs. This, in turn, increases the amount of fuel you can burn, allowing you to make more power.

Detailed Process:

• Complete Disassembly: Head is disassembled, and all soft plugs are removed.
• Cleaning and Blasting: Thorough cleaning and blasting to ensure a pristine surface.
• Crack Check: Performed to ensure structural integrity.
• New Components: Installation of all-new bronze guides and HD extra-large seats on both intake and exhaust sides.
• 5-Axis CNC Porting: Performed with the stock intake shelf in place for optimal airflow.
• High-Performance Valve Job: Precision CNC valve job performed for enhanced performance.
• Resurfacing: The head is resurfaced to meet exact specifications.
• Thorough Cleaning: Comprehensive cleaning process to eliminate all debris.
• Professional Painting: Painted for a durable and professional finish.
• Expert Assembly: Assembled with all new valve seals, soft plugs, and HD springs.
• Pressure Checking: Valves and coolant passages are pressure checked to ensure top quality and reliability.

D&J Precision Cylinder Heads Features:

• Enhanced Performance: Upgraded to 105-pound valve springs and a 5-axis CNC port job.
• Improved Airflow: Intake flow increased from 155 CFM to 220 CFM.
• Factory Intake Plenum: Retains the factory intake plenum for ease of installation.
• Comprehensive Upgrades: Includes all features of our HP Reman Head.
• For more information on D&J Precision call us at 1-859-737-4966.

Engines Covered by the Warranty

D&J Precision Machine Engine Limited Warranty - details click here