Heavy Hauler 6.7 Cummins Long Block

Our Heavy Hauler 6.7 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 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.

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.

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
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

Optional Upgrades:

D&J Billet Timing Cover
Billet valve cover
Billet black valve cover

Shipping and Core Charges:

Core Charge: $3000.00 (Cores can be sent in beforehand to eliminate this charge*)
Shipping: Varies for each purchase.

Cores must include usable block, 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, bolts, lower rocker box, and bolts. If there are issues with any of the parts, you will not be charged the full core amount, only the amount needed to replace the bad part. Our core charge is based on re-manufactured parts.

Upgrade to our Heavy Hauler 6.7 Cummins Long Block for unparalleled performance and reliability in your high-powered Cummins engine.

Heavy Hauler 6.7 Cummins Common Rail Long Block