D&J Performance Series 6.7 Cummins Long Block: The Ultimate Foundation

If you own a 6.7L Cummins, you bought it for its performance and history of reliability. But when your factory engine no longer meets your goals, the D&J Performance Series 6.7 Cummins Common Rail Long Block provides the ultimate foundation for power and durability.

Enter the Performance Series 6.7 Cummins Common Rail Long Block from D&J Precision Machine. Rated for up to 1,200 HP and 2,200 lb-ft of torque, this isn't just a rebuilt engine; it’s a precision-engineered masterpiece designed for those who demand max effort from their truck.

Why Choose a D&J Long Block?

D&J Precision Machine has built a reputation on the track and the street for one thing: precision. Every Performance Series long block undergoes a rigorous manufacturing process that eliminates pesky factory weak points.

CNC Machined Perfection

Every block starts with a comprehensive inspection that involves being disassembled, crack-checked, and blasted. From there, it moves to CNC machining. Unlike a standard rebuild, these blocks are CNC bored based on your specific application and torque plate honed. This ensures that when the head is torqued down, the cylinders stay perfectly round, providing the best ring seal possible.

High-Performance Stage 2 Cylinder Head

The heart of this build is the Stage 2 Performance Cylinder Head. It features:

• 5-Axis CNC Porting: Optimized for maximum airflow (250 CFM).
• Extra Large HD Seats: A common failure point on stock 6.7 heads is dropping valve seats; D&J fixes this with heavy-duty oversized seats.
• Fire Ring Grooves: To handle extreme cylinder pressures, fire ring grooves are cut into both the head and the block for a legendary seal.

Bulletproof Internals

You can’t put 1,200 HP through stock rods. That’s why this long block comes standard with D&J X-Beam Billet Rods. These are paired with a D&J HD Girdle and ARP 9/16" Main Studs to prevent crank walk and block flex under high boost.

Who Is This Engine For?

The Performance Series is the sweet spot in the D&J lineup.

• The Street Enthusiast: Perfect for the person running upgraded fueling and larger turbos who wants reliability.
• The Competition Build: A solid foundation for drag racing or sled pulling.
• The Heavy Hauler: If you’re towing heavy and want the peace of mind that your engine can handle the heat and pressure without breaking a sweat.

Customization & Options

D&J understands that every build is unique. You can customize your long block with:

• Year Specifics: Options for 2007.5–2012 or 2013–2018 platforms.
• Dual CP3 Timing Covers: For those running high-output fuel systems.
• Aesthetics: Every engine is pre-lubed and can be painted in virtually any color to match your build’s color scheme.

Investing in a long block is a major decision. You aren't just buying parts; you're buying the foundation of your build and the thousands of hours of R&D that D&J has put into the Cummins platform. With a 4 to 5-week build time, each engine is handcrafted to ensure that when you turn the key, you have the most reliable, high-output 6.7 on the road.

Learn more about the Performance Series 6.7 Cummins Long Block.