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D&J Precision Heavy Hauler Long Block Engine Dodge/Ram 6.7L Cummins 21-24

Thoroughbred Sku #: DJPLB100079-CRE

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$14,818.99

+ $375.00 Shipping

CORE RETURN NOTE: Shipping cost is one way (delivered to you) BD/D&J's makes returning your core easy. Use the return label from BD/D&J's website (CLICK HERE) and the cost will be deducted from your core credit.

* Core Exchange Option:

Terms & Conditions for Cores

Many stock replacement parts such as turbos, injectors, injection pumps, and high pressure oil pumps have a core charge that is associated with the new replacement part. You must return the old part to receive a refund on the core charge.

In some cases, the core is not reusable, such as in the event of a cracked case, at which point the core deposit would not be credited as the core component is not reusable.
Cores that have been disassembled and/or have missing and/or damaged major components will not receive full core credit.
Returned cores must be on a "like-for-like" basis, meaning that the returned core has the exact same fitment as the remanufactured component that was purchased. If the core is not "like-for-like," your core may not be eligible for return/credit.
You are responsible for core return shipping cost.

If you plan on returning your core you have two options.

Thoroughbred Diesel offers defer the upfront core charge when purchasing via credit card payment.

OPTION 1: You can accept the core charge, which means you will be charged for the part AND the core at time of purchase. You still have the option to send it back, and if you do, the core will be refunded back on the card used, presuming the core meets core criteria and the core is returned within 30 days from the time your order is received. If you return your core after 30 days you may refer to the Core Charge Timeline below as to how you will be refunded.

Core Charge Timeline

If the core is returned after 30 days, 90% of the core will be refunded.
If the core is returned after 60 days, 70% of the core will be refunded.
If the core is returned after 90 days, 50% of the core will be refunded.
After 6 months cores will be accepted at Thoroughbred’s discretion.

OPTION 2: You can defer the core charge. If you defer, you will not be charged for the core at the time of purchase. You will have 21 days from the time your order is received to send the core back. If the core is not received within the 21 days, your credit card will be charged for the core amount on your order. If you return your core after 21 days, you may refer to the Core Charge Timeline below as to how you will be refunded. When Core deferral (Pay Core Charge Later) is limited to payment by credit card only. ***When using PayPal or Affirm as your method of payment “Core Deferral (Pay Core Charge Later)” is not available. The core must be paid at time of purchase. ***

Core Charge Timeline

If the core is returned after 21 days, 90% of the core will be refunded.
If the core is returned after 60 days, 70% of the core will be refunded.
If the core is returned after 90 days, 50% of the core will be refunded.
After 6 months cores will be accepted at Thoroughbred’s discretion.

Core Return Procedure

Please keep all original packaging of your new item to be used for the core return.
Drain all fluids: oil, fuel, etc. out of the core before it is returned.
Place any plastic plugs or caps received on the new item back onto the core.
To insure UPS, Fed Ex, or USPS will not reject the package due to fuel or oil leakage, please wrap the core in a plastic garbage bag.
Place core inside the box.
If core return paperwork was inside the box, please complete the form and send back with the core.
Please provide a tracking number to [email protected]. Without a confirmed tracking number we cannot guarantee your core refund
If you have questions please call our core department 859-737-4966 ext. 5

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Product Details
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Product Details

Product Name: D&J Precision Heavy Hauler Long Block Engine Dodge/Ram 6.7L Cummins 21-24
Manufacturer: D&J Precision
Manufacturer Part #: DJPLB100079
Thoroughbred Diesel Part #: DJPLB100079
Fitment Notes: 2021-2024 Dodge/Ram 6.7L Cummins

D&J Precision Heavy Hauler 6.7 Cummins Long Blocks for 2019-2024 models 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 camshaft, which typically results in a 200-300 degree drop in EGT and an increase in fuel economy due to the additional airflow. These engines are assembled with the best parts available, backed by our years of experience in the high-performance diesel industry, making them perfect for demanding work trucks. This long block is rated for up to 700 hp, providing robust performance for high-demand applications.

To address common issues found in 2019-2024 engines, we utilize components from the more reliable 2018 and older models. These older platforms have a superior track record of reliability compared to the newer engines. By replacing the hydraulic roller lifter setup with solid flat tappets and adjustable rockers, we enhance both reliability and performance. Depending on the year selected, we will use 2019-2020 or 2021-2024 front covers and timing gear housings. The older platform allows for seamless integration, as everything bolts in the same way, and ensures more readily available and less expensive parts down the road.

Included:

New Pistons
12mm ARP main studs
D&J ARP 9/16" Head Studs torqued to 175 ft/lbs
D&J HD 7/16" Pushrods
D&J 200 CFM Stage 1 High-Performance Cylinder Head
D&J tow performance cast cam
New Tappets
New Oil Cooler
New Oil Pump
New Crankshaft Seals
Billet soft plugs (front, rear, and side)
Reconditioned stock connecting rods
Front cover installed
Machined rocker box
Machined rocker pedestals
OEM Adjustable Rocker Assemblies
Pre-lubed with break-in oil and filter included
Pressure-checked cooling system and crankcase to ensure no leaks on installation

D&J Precision Engine Features:

Comprehensive Inspection: Disassembled, crack-checked, blasted, and cleaned before machining.
Precision Machining: CNC bored, line bored, surfaced as needed, and torque plate honed to exact specifications.
Custom ARP Head Studs: 9/16" head studs provide the best head-to-block seal possible.
High-Performance Cylinder Head: D&J Stage 1 Performance Cylinder Heads are disassembled, crack-checked, fitted with extra-large heavy-duty seats, machined for thread-in soft plugs, and 5-axis CNC ported. Each head undergoes a CNC high-performance valve job and is pressure-checked before assembly and painting.
Blueprinted and Balanced: All engines are blueprinted, balanced, oil clearance measured, and rings file fit.
Pre-lubed and Painted: Engines are painted black and shipped pre-lubed with break-in oil and filter included.
Machined Rocker Box and Pedestals: Ensures a precise fit and optimal performance.
High Power Rating: Rated for up to 700 hp, suitable for high-demand applications. WE DO NOT RECOMMEND INCREASING HORSEPOWER ON HEAVY TOWING APPLICATIONS. TURN THE TUNE DOWN FOR HEAVY TOWING IF YOUR TRUCK IS NOT STOCK.
Improved Components: Utilizes 2018 and older engine components to replace hydraulic roller lifters with solid flat tappets and adjustable rockers.
Year-Specific Components: Depending on the year selected, we will use 2019-2020 or 2021-2024 front covers and timing gear housings.
For more information on D&J Precision call us at 1-859-737-4966.

Engines Covered by the Warranty

Engine Model	Warranty Period	Coverage
Essential Reman Engines	2 years / 100,000 miles	Parts & Labor
Precision Plus Reman Engines	2 years / 100,000 miles	Parts & Labor
Heavy Hauler Engines	2 years / 100,000 miles	Parts & Labor
Street Performance Series Engines	90 days	Parts & Labor
Performance Series Engines	90 days	Parts & Labor
Predator Engines	90 days	Parts & Labor
Enforcer 6.7 Cummins Engines	90 days	Parts & Labor

D&J Precision Machine Engine Limited Warranty - details click here

Reviews

Submit a question

What weight oil do you recommend running in this D&J heavy hauler engine? I know the original motor called for 10w30, but I didn’t know if changing the internals would allow me to use the old 15w40. Thank you!

Keith Moye | 6/19/2025
Pre-lubed with break-in oil and filter included

We recommend using Hot Shot Secret Black Diamond Outlaw full synthetic 15w-40

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