The head is machined for thread in soft plugs and 5-axis CNC ported. Stock seats are removed and replace with our extra-large heavy-duty seats. D&J Stage 1 Performance Cylinder Heads are completely disassembled and checked for cracks. We use custom ARP 9/16″ head studs to give the best head to block seal possible. Each block is CNC bored depending on the application, line bored, surfaced as needed, and torque plate honed to exact spec. HP Reman Extreme 5.9 Cummins Long Block are disassembled, crack checked, blasted and cleaned before we start machining. We assemble these engines with the best parts available in the industry including Cummins, Mahle Clevite, and ARP. Customers typically see a 200-300 degree drop in EGT and a fuel economy increase from the additional air flow. With our Stage 1 High Performance Cylinder Head. Our HP Reman Extreme 5.9 Cummins come fully assembled including oil pan rear crank seal front cover and crank seal, and oil filter housing.
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