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 DandJ Stage 1 High-Performance Cylinder Head, a street/towing camshaft for lower EGTs, and custom ARP 9/16 Inch 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 DandJ Precision Machine, this long block is ready for installation with an oil pan, front cover, and pre-lubed break-in oil included.

Warranty:

Parts

24-Months

Labor

24-Months

Note:
Not for sale on licensed California vehicles

Features:

• Rated for up to 700 HP - Designed for demanding work applications, though high-horsepower tuning is not recommended for heavy towing
• Precision CNC Machining - Blueprinted, bored, honed, and torque plate honed for maximum strength and reliability
• High-Performance Cylinder Head - 5-axis CNC ported with extra-large heavy-duty valve seats for improved airflow and efficiency
• Street/Towing Performance Camshaft - Lowers EGTs by 200-300 degrees while increasing fuel economy
• Custom ARP 9/16 inch Head Studs - Provides superior head-to-block sealing for high-boost applications
• Fully Assembled and Pre-Lubed - Includes oil pan, front cover, rocker box, and break-in oil for seamless installation