D&J Heavy Hauler Long Block Engine 19-24 Ram 6.7L Cummins

Are you looking to get your 6.7L Cummins back to running like new and prepare it for power upgrades? The Heavy Hauler Long Block from D&J Precision Machine is built for trucks that see constant use, towing heavy, racking up miles, and working day in and day out. It’s not focused on peak horsepower or performance numbers; it’s built around reliability and long-term durability under real-world use.

This is the kind of setup you choose when reliability matters more than anything else. It delivers consistent performance under sustained load, improved durability where factory engines tend to wear, and the confidence that your truck can handle what you throw at it without second-guessing. If your truck earns its keep, this is the foundation that keeps it doing exactly that.

Each Heavy Hauler long block is fully assembled and built with durability as the top priority, including key components like the oil pan, front cover, and sealing components, pre-installed to streamline installation and ensure consistency right out of the crate.

The internal build focuses on strengthening critical areas that see the most stress in towing and high-load applications. Precision machining processes restore proper tolerances throughout the block and rotating assembly, while upgraded components and careful assembly practices improve longevity under constant heat, pressure, and load cycles.