Built to Work: Why the D&J Heavy Hauler Long Block is the Ultimate Upgrade for 2019+ Cummins Trucks
Built to Work: The Heavy Hauler Long Block for 2019+ Cummins Trucks
If you drive a 2019 or newer 6.7L Dodge Ram Cummins, you already know the truck is capable of some serious work. But if you haul heavy loads, tow daily, or just push your Cummins hard in general, you’ve likely come across the biggest issue hiding under the hood of the 2019+ platform: the factory hydraulic lifter setup.
At D&J Precision Machine, we designed the Heavy Hauler 2019+ Long Block to address this exact issue. Engineered specifically for truck owners who demand reliability under consistent loads, this build isn't just a replacement, it's a complete structural correction and performance upgrade for your truck.
The Problem: What Goes Wrong with the 2019+ Factory Lifters?
When Ram transitioned the 6.7L Cummins to a CGI (Compacted Graphite Iron) block in 2019, they also introduced factory hydraulic roller lifters. While the design aimed to reduce maintenance, real-world heavy towing quickly revealed a major vulnerability: hydraulic lifter failure, severe camshaft wear, and potential catastrophic engine breakdown under heavy loads.
If you rely on your truck for towing trailers, hauling equipment, or everyday work, taking a chance on a failure in the middle of a job simply isn't an option.
The Fix: How the Heavy Hauler Eliminates the Weak Points
Instead of re-installing the factory hydraulic lifter setup, our Heavy Hauler Long Block back-dates the valvetrain architecture to the battle-tested solid flat tappet design using 2018 and older platform components.
1. Bulletproof Valvetrain Architecture
We eliminate the failure-prone 2019+ hydraulic roller lifters and replace them with:
- Solid flat tappet lifters for positive, predictable valvetrain engagement.
- OEM adjustable rockers, ensuring precise valve clearances and long-term durability.
- Heavy-duty 7/16” pushrods that resist flexing under high cylinder pressure.
2. Drastically Lower EGTs & Better Airflow
Heat is the enemy of towing durability. Every Heavy Hauler 2019+ Long Block comes standard with our D&J Stage 1 High-Performance Cylinder Head:
- 200 CFM Airflow Rating: Flows significantly better than factory heads to let the engine breathe freely.
- 200–300°F EGT Reduction: Substantially lowers exhaust gas temperatures under heavy load, protecting your turbo and engine internals.
- D&J Custom Towing/Street Camshaft: Tailored specifically to build broad, smooth low-end torque where work trucks need it most.
3. High-Strength Fasteners & Precision Bottom End
To hold up against extreme cylinder pressures, every engine is built using premium heavy-duty hardware:
- ARP 9/16” Head Studs and 12mm ARP Main Studs for maximum clamping force and head-gasket retention.
- Fully Blueprinted & Balanced: The entire dynamic rotating assembly is precision-balanced to minimize vibration and internal wear.
Specifications at a Glance
| Component | Heavy Hauler 2019+ Long Block Spec |
|---|---|
| Engine Platform | 2019+ Ram 6.7L Cummins (CGI Block) |
| Lifter Setup | Solid Flat Tappet (Eliminates factory 2019+ hydraulic setup) |
| Cylinder Head | D&J Stage 1 High-Performance (200 CFM) |
| EGT Delta | 200°F to 300°F reduction under heavy load |
| Fasteners | ARP 9/16" Head Studs & 12mm ARP Main Studs |
| Included Accessories | Pre-installed oil pan, front cover, rear main seal, break-in oil & filter |
True Drop-In Convenience
A long block replacement should be as painless as possible. When your Heavy Hauler arrives, it is fully painted black, pressure-checked, and pre-lubed. We pre-install the front cover, oil pan, and rear main seal so your installer or shop can complete the swap with minimal downtime. We even include the initial break-in oil and filter right out of the crate.
Ready to Give Your Rig the Reliability It Deserves?
Whether you're building a reliable 700 HP street setup or need an indestructible motor for a fleet vehicle, the Heavy Hauler 2019+ Cummins Long Block is built to outlast the job site.