Discover top-quality parts for your 1989-1993 1st Gen 12 Valve Cummins Dodge Ram truck. From engine rebuild parts to performance upgrades, find all...

2nd gen 12v 1994-1998

2nd gen 24v vp44 1998-2002

Shop parts for your 3rd gen 5.9 2003-2004 Dodge Ram Pick up

3rd gen 5.9 2004.5- 2007

3rd gen 6.7 2007.5-2009

4th gen 6.7 2009-2012

4th gen 6.7 2013-2018

5th gen 6.7 2019+

BILLET SCCESSORIES

CORES

Our FSR (Forged Steel Ring) Billet 5.9 Cummins Pistons were designed to solve the common problem of beating the top ring land out...

We design our Cummins billet valve covers in house for the best balance of fit, finish, and functionality, while keeping your budget in...

D&J Precision Machine Cummins heads are a step up in the diesel performance industry. With years of experience, we designed our ported Cummins...

Our ported Cummins heads are a step up in the diesel performance industry. With years of experience we designed our ported Cummins heads...

Performance Cummins Head Our Cummins Reman Head has all the necessary upgrades to make your head durable and reliable. You're given the option...

Our Cummins Stage 1 High Performance Head is a step up in performance without the extra expense and work involved with an aftermarket...

Our Cummins Stage 2 Performance Head is designed for the performance enthusiast. Includes everything in our Stage 1 Cummins Performance Head and a...

Our Cummins Stage 3 Performance Head is designed for the extreme high performance. Includes everything in our Stage 2 Cummins Performance Head, with...

BEHIND THE WHEEL OUR CUSTOMERS Our customers here at D&J Precision Machine are a huge part of our business. Not only do they...

At D&J Precision Machine, our Cummins cylinder heads are made with pride and care for every customer. Our cylinder head parts are of...

CYLINDER HEAD PARTS

CYLINDER HEADS

D&J APPAREL 

These items are new blemished parts. These products are fully functional with minor cosmetic imperfections. All sales are final for these items.

The Essentials Reman Long Block is designed to provide an affordable yet reliable and efficient solution for your diesel engine needs. Built with...

D&J Precision Machine offers our finish machined Blocks to our do-it-yourself clients.

D&J Precision Machine Products. If you're looking for the best parts in the business for your diesel, you've come to the right place....

D&J reconditioned parts. These items are those most commonly requested by our customers.

Here you'll find commonly requested and hard-to-find used parts. Don't see what you're looking for? Give us a call and ask! We just...

D&J Precision Machine ENFORCER Deck Plate Short Block. Our ENFORCER 6.7 Deck Plate Cummins come fully assembled from oil pan to head gasket...

ENGINE PARTS

Exergy Performance

Firepunk Diesel

FLUIDS AND FILTERS

Our D&J Precision Machine Cummins Billet Freeze Plug design does not require drilling or tapping of the block. To hold our freeze plug...

FSR Cummins Billet Pistons Our FSR (Forged Steel Ring) Billet Cummins Pistons were designed to solve the common problem of beating the top...

The Original Billet FSR (Forged Steel Ring) Performance Pistons D&J Precision Machine was the first aftermarket diesel performance company to produce FSR (forged...

D&J Cummins Head Gasket Kit . Includes a genuine Cummins head gasket, exhaust manifold gaskets, long intake gasket air horn gasket, injector install...

D&J HP Reman Cummins

D&J In Stock Specials. Heads, Engines, Accessories. Get 'em while they last! Check back weekly for the latest deals.

INJECTORS AND FUEL SYSTEM

Did you just buy a D&J Precision Machine product and need installation instructions or advice? Use our helpful web-guide to help you step-by-step!

INTAKE MANIFOLDS

LONG BLOCKS

Are you in the search for a brand new D&J Precision Machine shirt featuring our logo on the front and back? Or how...

READY TO ASSEMBLE BLOCKS

SHORT BLOCKS

SOFT PLUGS

TIMING GEAR COVERS AND HOUSINGS

TRANSMISSIONS

TUNING AND WIRING

TURBOS

Don't see what you're looking for? Give us a call and ask! We just may have it! Part numbers are in product descriptions....

Don't see what you're looking for? Give us a call and ask! We just may have it! Part numbers are in product descriptions....

Don't see what you're looking for? Give us a call and ask! We just may have it! Part numbers are in product descriptions....

Don't see what you're looking for? Give us a call and ask! We just may have it! Part numbers are in product descriptions....

Here you'll find used, standard-size original Cummins pistons. Disclaimer- These are used parts that have been visually inspected. No expressed or implied warranty...

VALVE COVERS

There is no longer a need for the complication of two electric lift pumps. Our Billet waterman direct drive kit is capable of...

D&J Wrist Pins

Proven over 3000hp and 4000tq, we design our X-BEAM Cummins Rods with our unique “X” profile to maximize the strength while reducing weight....

Proven over 3000hp and 4000tq, we design our X-BEAM Cummins Rods with our unique “X” profile to maximize the strength while reducing weight....