The Heavy Hauler 6.7 Cummins Long Block is designed for demanding work trucks, towing applications, and high-horsepower builds, delivering up to 700 HP while improving airflow, efficiency, and durability.

Built with a DandJ Stage 1 High-Performance Cylinder Head, a street/towing camshaft for lower EGTs, and custom ARP 9/16 Inch head studs for superior sealing, this long block ensures maximum strength under extreme loads.

To increase reliability, this build incorporates 2018 and older engine components, replacing hydraulic roller lifters with solid flat tappets and adjustable rockers. Each engine is CNC-machined, fully blueprinted, and assembled with premium components, ensuring maximum strength and longevity.

Manufactured by DandJ Precision Machine, this engine is built to outperform and outlast stock configurations in the toughest applications.

Warranty:

Parts

24-Months

Labor

24-Months

Note:
Not for sale on licensed California vehicles

Features:

• Rated for up to 700 HP - Built for towing, heavy-duty use, and high-performance applications (not recommended for high-horsepower tuning in heavy towing)
• Stage 1 High-Performance Cylinder Head - 5-axis CNC ported with heavy-duty oversized intake and exhaust seats for increased airflow
• Street/Towing Performance Camshaft - Lowers EGTs by 200-300 degrees, improving fuel efficiency and reliability
• Upgraded 2018 and Older Components - Replaces hydraulic roller lifters with solid flat tappets and adjustable rockers for greater durability
• Fully Assembled and Pre-Lubed - Includes oil pan, front cover, machined rocker box, and break-in oil for seamless installation