D&J - Heavy Hauler Long Block - 2021-2024 Dodge 6.7L Cummins - DJPLB100079

Part # DJPLB100080

The Heavy Hauler 6.7 Cummins Long Block is designed for demanding work trucks, towing applications, and high-horsepower builds, delivering up to 700 HP while improving airflow, efficiency, and durability. Built with a D&J Stage 1 High-Performance Cylinder Head, a street/towing camshaft for lower EGTs, and custom ARP 9/16” head studs for superior sealing, this long block ensures maximum strength under extreme loads. To increase reliability, this build incorporates 2018 and older engine components, replacing hydraulic roller lifters with solid flat tappets and adjustable rockers. Each engine is CNC-machined, fully blueprinted, and assembled with premium components, ensuring maximum strength and longevity. Manufactured by D&J Precision Machine, this engine is built to outperform and outlast stock configurations in the toughest applications.

Key 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.
• Street/Towing Performance Camshaft - Lowers EGTs by 200-300 degrees, improving fuel efficiency and reliability

Build Includes:

• 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

High-Performance Cylinder Head Includes:

• All new HD bronze valve guides installed
• Heavy-duty extra-large intake and exhaust seats installed
• Industry-leading 5-axis CNC port job
• Thread-in soft plugs under the valve cover
• High-performance CNC valve job performed
• New valve seals and soft plugs installed
• New 105# springs installed

Core Returns

Cores must include usable crank, cylinder head, rocker bases, oil pan and bolts, pickup tube, timing gear housing, timing gear housing cover and bolts, rear seal housing and bolts, piston cooling nozzles, lower rocker box, and bolts.  Freight charge for core return will be deducted from the core charge.

D&J PRECISION MACHINE

Located in the heart of Ohio, D&J Precision Machine emerged from humble beginnings, where Founder Drew Pumphrey’s passion for diesel performance led to a revolution in the diesel engine industry. With a modest investment, Drew’s drive turned D&J into a diesel powerhouse, pushing boundaries in Zanesville and Cambridge, Ohio.

As a proud member of the Burnout Brands group of companies, D&J Precision Machine stands with BD and Monster Transmission as a beacon of excellence in the automotive aftermarket sector.