Built for demanding work trucks and heavy-duty applications, the Heavy Hauler 6.7 Cummins Long Block is a fully assembled, precision-engineered powerhouse rated for up to 700 HP. Designed for optimal airflow and efficiency, this long block includes a D&J Stage 1 High-Performance Cylinder Head, a street/towing camshaft for lower EGTs, and custom ARP 9/16 head studs to ensure superior sealing strength. Every unit undergoes CNC blueprinting, precision machining, and a comprehensive quality control process, delivering unmatched durability and longevity. Manufactured by D&J Precision Machine, this long block is ready for installation with an oil pan, front cover, and pre-lubed break-in oil included.
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