Are you looking to get your 6.7L Cummins back to a solid, reliable foundation? The Precision Plus Reman Long Block from D&J Precision Machine is built as a complete, ready-to-install solution that focuses on restoring durability, consistency, and long-term reliability for real-world use.

This long block comes fully assembled with key components already installed, including the oil pan, front cover, crank seals, and oil filter housing, making installation more straightforward and reducing the number of parts you need to source or transfer. It’s built to deliver a dependable, stock-plus level foundation that tightens up factory inconsistencies and gives you a clean starting point for a truck that just needs to be reliable and stay that way.

Each Precision Plus long block is fully disassembled, inspected, and CNC machined to restore all critical tolerances before assembly. The block is bored, honed, and decked, while internal components are measured and corrected to ensure proper clearances for oil control, compression, and long-term durability. Assembly is done in a controlled environment with attention to sealing, cleanliness, and consistency across every build.

The engine is also built using a durability-focused approach specific to heavy-use applications, incorporating remanufactured and upgraded components where needed to address common weak points in the platform. The goal is simple: a clean, properly machined long block that’s ready to handle towing and daily use without becoming a liability down the road.