6.7L Long Block Workhorse 2019-2024 Cummins Dodge Diesel Engine

Part Number / SKU: CEP67CLW1920

The “Workhorse” model is specifically designed for the working man who requires maximum durability and reliability for regular heavy hauling and strenuous towing.

The 2019+ Cummins: Known Issues, Proven Fixes

The 2019 and newer Cummins engines have become infamous among diesel owners, widely considered the "dark ages" of the platform due to significant reliability issues. From camshaft failures to weakened engine blocks, these trucks haven’t lived up to the legacy Cummins is known for.

That’s why at Aero Engines Inc, we don’t just repair, we completely overhaul and restore the durability you expect. After extensive R&D, we determined the best solution is to retrofit the entire engine back to the reliable 2018 platform.

We replace the problematic lightweight 2019+ block (which is 75 lbs lighter due to material being removed from critical areas) with the solid cast iron block used in 2018 models, a major step in restoring strength and longevity.

Instead of using the roller lifters and matching camshaft found in 2019+ models, we install the more proven flat tappet lifters and 2018 camshaft. This, along with other trusted 2018 parts, ensures your build holds up like the Cummins name should.

What We Do Differently:

• 2018 Cast Iron BlockNo more thin, lightweight block from 2019+
• Flat Tappet LiftersReplacing roller lifters that commonly fail
• 2018 Camshaft – Better reliability and wear resistance

Aero Engines Inc restores the power and trust you’ve always counted on, the right way.

Key Features and Fixes

Upgrades Over the Daily Driver:

• O-Ringed Heads
• Coated and Fly Cut Pistons
• Stage 2 Cam
• Chromoly Pushrods

Core Performance & Power

• High-Output Performance: Rated for 600+ HP capability, delivering significant power over stock for demanding applications.
• Fully Balanced Rotating Assembly: Precision-balanced components ensure smooth, vibration-free operation and extended bearing life at high RPMs.

Reliability & Durability Upgrades

• Upgraded Pistons: Upgraded pistons that are inherently stronger and designed for more robust commercial applications. This solves the OEM issue of weak pistons that are prone to cracking under heat and boost. The Workhorse takes this a step further with Coated and Flycut pistons for maximum thermal resistance and durability.
• Enhanced Valve Integrity: Features all-new, upgraded material valves that eliminate the high-heat separation common in OEM exhaust valves, preventing compression loss and piston-to-valve contact.
• Improved Head Sealing: O-Ringed heads provide a superior seal, essential for maintaining integrity under high cylinder pressures.
• Stage 2 Valvetrain & Drivetrain: Equipped with a Stage 2 Camshaft and Chromoly Pushrods for enhanced strength.

Machining Process:

Aero Engines Inc doesn’t just rebuild engines - we remanufacture them. Each of our engines undergoes extensive, precision machine work to correct OEM flaws and ensure durability and reliability.

Engine Block Machining:

Each of our engine blocks are CNC blueprint machined using state-of-the-art CNC machines. This process ensures perfect dimensions, precise tolerances, and optimal alignment. This starts with decking the surface of the block to achieve the necessary flatness and smoothness (Ra 30 or better) required for flawless sealing with MLS head gaskets. The cylinders are then diamond honed to an extremely tight tolerance to match the piston diameter (within the nearest 0.0001 inch). Following honing, the main bearing bores are line honed to establish a true, straight centerline for the crankshaft. Finally, the cylinder bores are bored to a true 90 degree angle from the crankshaft centerline.

Cylinder Head Machining:

Our cylinder heads are fully machined and enhanced in-house to improve airflow and reliability. Each head is first magnafluxed and pressure tested to ensure they are free of any cracks or leaks. The surface is then precision decked to an extremely smooth finish, guaranteeing the necessary flatness for a perfect seal with MLS head gaskets. For enhanced durability, o-rings are cut and installed into the deck surface to dramatically improve sealing under high cylinder pressures. Internally, the valve seats are machined to optimize airflow and prevent common failures, and the entire valve train geometry is blueprinted to specific tolerances to reduce lifter preload and prolong component life.

Rotational Assembly Balancing:

The balancing of the rotational assembly is crucial for eliminating vibration and maximizing engine longevity. This precision work involves checking and correcting the balance of the crankshaft, connecting rods, and pistons. The crankshaft is thoroughly checked for run-out and inspected for fatigue before being polished and ground to strict concentricity tolerances (0.0005 or less) to ensure the new bearings receive the best possible surface. Rods are inspected and conditioned, and all bearing clearances checked to ensure proper fitment with the new bearings. Each of the pistons, rings, and pin retainers are meticulously weight matched (to a tolerance of 2 grams or less) prior to crank balancing. Then the entire assembly is dynamically balanced on specialized equipment. This ensures that the engine runs smoothly, minimizing stress on the bearings, and extends the overall life of the components.

Components and Parts:

Engine Core Components

• Cylinder Block
• Crankshaft
• Steel Connecting Rods
• Stage 2 Camshaft
• Coated and Flycut Pistons
• O-Ringed Cylinder Head
• Chromoly Pushrods
• New Main Bearings
• New Rod Bearings
• New Cam Bearings
• Main Bolts
• Head Studs
• Rockers
• Billet Freeze Plugs
• New Oil Pump
• Upper Oil Pan
• Lower Oil Pan

Gaskets and Seals

• New Head Gaskets
• Rear Main Seal and Housing
• Front Gear Housing

Cylinder Head Components

• O-Rings
• New Valve Guides
• New Socket Plug
• New Oversized Valve Seats
• New Threaded Plugs