The Heavy Hauler 6.7 Cummins Common Rail Long Block is built for demanding work trucks, towing applications, and high-horsepower builds. Rated for up to 700 HP, this long block features a D&J Stage 1 High-Performance Cylinder Head, a street/towing camshaft for improved airflow and fuel efficiency, and custom ARP 9/16 head studs for superior head-to-block sealing. Each engine undergoes CNC blueprinting, precision machining, and extensive quality control to ensure unmatched durability and performance. Fully assembled with an oil pan, front cover, rocker box, and pre-lubed with break-in oil, this long block is ready to handle the toughest applications. Manufactured by D&J Precision Machine, this engine is designed for reliability, power, and efficiency.
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