D&J Precision Machine Products

5.9 CR Stage 1 Cummins Performance Head   Our 5.9 CR Stage 1 Cummins Performance Head is a step up in performance without the extra expense and work involved with an aftermarket intake. This head includes everything in our HP Reman Head along with...

Use only the best with our D&J Cummins Head Gasket Kit 5.9 VP44 1998-2002 Includes a head gasket, exhaust manifold gaskets, long intake gasket, air horn gaskets, injector install kit with cross tube o-ring, and thermostat gasket.

Use only the best with our D&J Cummins Head Gasket kit 2007-2007 5.9 Common Rail. Includes genuine Cummins head gasket, exhaust manifold gaskets, long intake gasket air horn gasket, injector install kit with cross tube o-ring, rocker box gasket, and thermostat gasket.

 Billet Valve Cover 03-05 Black Powder Coat Our Billet Valve Cover 03-05 is meticulously designed in-house to achieve the perfect balance of fit, finish, and functionality, all while keeping your budget in mind. Made from aircraft-quality 6061-T6 aluminum, these valve covers come complete with...

5.9 Common Rail Head Gasket set with 4.305" x .105" rings 

D&J 5.9 Common Rail HP Reman Block At D&J Precision Machine, we understand the value of providing our customers with the option to rebuild their own engines. With that in mind, we present a budget-friendly alternative to our full in-house engine builds: the D&J...

Use only the best with our D&J Cummins Head Gasket Kit 1989-1998 5.9L 12V. Includes A head gasket, exhaust manifold gaskets, long intake gasket, air horn gaskets, injector install kit, and valve cover gaskets.

Billet Air Shut-Off Guillotine   Our Billet Air Shut-Off Guillotine is designed for high-performance applications, providing reliable performance, durability, and enhanced safety. Featuring a dual internal spring design and a 1/4-inch thick aluminum blade, this setup ensures efficient air shut-off when needed. It includes...

Heavy Hauler 5.9 Cummins Long Block Our Heavy Hauler 5.9 Cummins Long Blocks come fully assembled, including the oil pan, rear crank seal, front cover and crank seal, and oil filter housing, along with our Stage 1 High-Performance Cylinder Head. We include a street/towing...

OEM Cummins oil pump for 2003+ engines. 

The Strongest Billet Cummins Rods On The Market   Our stock length X-BEAM Billet Cummins Rods are proven to withstand over 3000hp and 4000 lb/ft. We design these rods with our unique "X" profile to maximize strength while reducing weight. Made from extreme high...

ISB Stage 1 24v Cummins Performance Head Elevate your engine's performance with our ISB Stage 1 24v Cummins Performance Head. Designed to enhance power without the added cost and complexity of an aftermarket intake, this performance head combines the best of our industry-leading remanufactured...

The 5 Axis Intake Horn fits a 6.7 intake and can have a 3.5" or 4" vibrant clamp welded onto it. It does not have an oil dipstick relocation bracket. It will work in factory pickup, but will need some custom fabrication to make...

6.7 Cummins Essentials Reman Long Block Overview The Essentials Reman Long Block is designed to provide reliable and efficient performance for your diesel engine needs. Built with precision and care, this remanufactured engine is perfect for those seeking quality and affordability. Key Features Comprehensive...

  D&J Precision Machine Oil Cap Cover Our D&J Precision Machine Oil Cap Cover is a great way to represent our brand. This cover is the same one included in our Billet Valve Cover items. Suit up your engine with our oil cap cover,...

1/2" Taller Billet 5.9 Cummins Grid Heater Replacement   Our 1/2" Taller Billet 5.9 Cummins Grid Heater Delete is designed to provide extra clearance for injection pumps and injection lines, optimizing airflow into your engine and preventing boost leaks for your Dodge 5.9L Cummins...

  5.9 Cummins Tool Steel Wrist Pins   D&J Precision Machine manufactures our tool steel wrist pins in-house at our facility in the United States, using the highest quality materials. Leveraging years of experience in high-performance diesel technology, we have designed these wrist pins...

D&J Precision Machine Cummins Titanium Retainers   Designed for 1998 and up 24v Cummins cylinder heads, our D&J Precision Machine Cummins Titanium Retainers are meticulously crafted in-house for superior performance. These valve spring titanium retainers are 10 grams lighter than the stock retainers, providing...

Features Upgraded Valve Seats - Taller and larger than stock, made from heat-resistant alloy to prevent loosening and failure Improved Heat Dissipation - Larger seats distribute heat more efficiently into the casting, reducing the risk of cracking Genuine Cummins Valves - Ensures OEM-level durability...

  5.9 CR HP Reman Cylinder Head   Our 5.9 CR Performance Cummins Reman Head includes essential upgrades to ensure durability and reliability, addressing common issues associated with these heads. One prevalent problem with factory and many aftermarket heads is the valve seats loosening...