![]() Fire Ring grooves are cut into the cylinder head and the block along with 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, CNC machined for the girdle and studs, and torque plate honed to exact spec. Our Performance 6.7 Cummins Long Block are disassembled, crack checked, blasted and cleaned before we start machining. We custom build this engine for your application, with the best parts available in the industry including Cummins, Mahle Clevite, and ARP. Our Performance 6.7 Cummins come fully assembled from oil pan to rockers with our X-Beam Stock Length Billet Rods and our Stage 2 High Performance Cylinder Head. D&J Precision Machine Performance 6.7 Cummins Long Block.
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