We’re redefining diesel performance with our advanced Cummins heads, crafted for power and reliability. Our process includes thorough disassembly, inspection, and precision treatments. The heads undergo 5-axis porting if needed, ensuring optimal flow. Our high-performance CNC valve job and rigorous cleaning process guarantee top quality.

With Stage 2 and Stage 3 replacement billet intake manifolds, we maintain proximity to factory components for compatibility with twin CP3 kits, minimizing modifications. Our intake design disperses air evenly, preventing localized overheating. The use of CNC 5-axis Centroid porting enhances efficiency and flow, maintaining material integrity. Experience elevated performance and reliability with D&J Precision Machine.