The Heavy Hauler 5.9 Cummins Common Rail Long Block is built for towing, heavy-duty work, and high-performance applications, delivering up to 700 HP while improving airflow, fuel efficiency, and durability.

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 for maximum sealing strength.

Fully blueprinted, CNC-machined, and pre-lubed with break-in oil, this long block is engineered for superior reliability and performance.

Manufactured by DandJ Precision Machine, this engine is designed to handle extreme workloads with ease.

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
• Stage 1 High-Performance Cylinder Head - 5-axis CNC ported with heavy-duty oversized intake and exhaust seats for maximum airflow and durability
• Street/Towing Performance Camshaft - Lowers EGTs by 200-300 degrees, improving efficiency and fuel economy
• Custom ARP 9/16 inch Head Studs - Delivers 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 quick installation