D&J Precision Cummins Cylinder Heads & Blocks

D&J Precision Machine is a Cambridge, Ohio machine shop that builds cylinder heads, long blocks, short blocks, and billet aluminum components engineered specifically for the Cummins engine platform, from 1st-gen 5.9L trucks through the current 6.7L. Every part is made in the USA at their own facility rather than outsourced, which matters when you're betting the bottom end on it. CFM Diesel Performance stocks D&J Precision parts for Ram Cummins builds that need to hold power, not just make it.

D&J Precision

Why Cummins Builders Trust D&J Precision

D&J Precision Machine operates out of its own facility in Cambridge, Ohio, founded by Drew Pumphrey on the idea that fabrication skill and real machining precision belong in the same shop.

The catalog covers billet aluminum cylinder heads, complete long and short blocks, and machined engine components spanning 1st-generation 5.9L Cummins trucks through the newest 6.7L applications.

CFM Diesel Performance stocks a growing selection of D&J Precision parts for Ram Cummins trucks cylinder heads, blocks, and billet components below. Building toward serious power and need a part matched to your setup? Contact our team and we'll help you spec it out.