Precision Plus 6.7L Cummins Long Block (2021–2024) | BD Diesel

By Ben Dow
4 min read
Precision Plus 6.7L Cummins Long Block (2021–2024) | BD Diesel

Precision Plus Long Block: 2021–2024 Ram 6.7L Cummins

Built for real work. BD Diesel’s new Precision Plus Long Block is a fully blueprinted, drop-in 6.7L Cummins foundation engineered for street, towing, and fleet duty—without the high-horsepower compromises.

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Quick Summary: Year-correct 2021–2024 front cover & timing gear housing • Fully CNC-machined, blueprinted, and pre-lubed • Solid flat tappets & adjustable rockers replace 2019+ hydraulic rollers • Upgraded cylinder head with extra-large seats & precision CNC valve job • Includes oil pan & front cover • 24-month parts & labor coverage • 50-state legal (replacement engine).

Jump to: Who it’s for • What’s included • Why it’s stronger • Fitment & compatibility • Install & break-in • Warranty & emissions • FAQ

Who This Long Block Is For

  • Work & tow rigs that need OEM-smooth manners with serious durability under heat, load, and hours.
  • Daily drivers & fleets chasing reliability first—no chasing big power numbers or aggressive tuning.
  • 2019+ valvetrain peace of mind: replaces hydraulic roller lifters with solid flat tappets + adjustable rockers to remove a known failure point in newer architectures.

What’s Included (Fully Assembled & Pre-Lubed)

  • Year-specific front cover & timing gear housing (’21–’24) for seamless accessory and sensor alignment.
  • Remanufactured cylinder head with extra-large valve seats, precision CNC valve job, pressure tested.
  • Short block that’s fully blueprinted, CNC bored/honed/decked, balanced, and oil-clearanced to spec.
  • Solid flat tappets & adjustable rockers (replaces 2019+ hydraulic roller lifters) for long-term durability.
  • Oil pan & front cover installed; shipped pre-lubed with break-in oil—ready to prime and fire.

Designed for demanding work applications; high-horsepower tuning is not recommended.

Why Precision Plus Is Stronger Than a Typical Reman

  • True blueprint machining: torque-plate honing, deck surfacing, and line work to restore factory geometry and ring seal under load.
  • Valvetrain simplification: solid lifters & adjustable rockers remove hydraulic roller risk, stabilize lash, and improve predictability at work RPM.
  • Head durability: extra-large valve seats + precision valve job for hot-soak towing and extended idle stability.
  • Year-specific front end: sensors, tone wheels, and accessory fitment line up with your 2021–2024 truck—no guessing, no adapters.

Fitment & Compatibility

  • Platform: Ram 2500/3500, 6.7L Cummins model years 2021–2024.
  • Front cover/timing housing: matched to 2021–2024 layouts for clean accessory and sensor integration.
  • Use case: street, towing, fleet, and work-truck duty. Not intended for high-HP tuning.
  • Emissions: replacement engine—retain all OEM emissions equipment and calibrations.

Best practice: confirm fitment by VIN before ordering, especially on mid-year changes and HO vs. standard output configurations.

Install & First Start: Best Practices

Pre-Install Checklist
  • Cooling system: flush; inspect radiator, heater core, hoses, degas cap.
  • Oil system: new cooler & filters; verify correct break-in oil is pre-filled (included) and prime before first fire.
  • Fuel system: clean tank/lines; replace filters; purge air; ensure clean supply—protect new injectors.
  • Sensors & harnesses: transfer carefully; inspect connectors and grounds.
  • Exhaust/intake: check for cracks, leaks, and warped flanges; replace gaskets.
First Start & Break-In
  • Prime oil to build pressure before lighting.
  • Initial run at 1,800–2,200 RPM for ring seating; vary RPM—no extended idling.
  • Load cycling: gentle drive cycles, no wide-open throttle or heavy tow for the first 500 miles.
  • Oil & filter change after break-in interval; monitor for debris as normal quality control.
  • Valve lash set & re-check (solid lifter/adjustable rocker system) per spec after initial heat cycles.

Recommended Companion Parts (Reliability Stack)

  • OE-calibrated fuel system health: fresh filters, clean tank; protect injectors and pump.
  • High-capacity cooling & quality thermostats if the truck tows in hot climates or grades.
  • Heavy-duty exhaust manifolds (year-appropriate) to resist thermal cycling and maintain clamp load.
  • Transmission service and quality ATF—engine longevity is wasted if the trans runs hot or flares.

Warranty & Emissions

Warranty: 24-Months Parts & 24-Months Labor

Emissions: This replacement engine does not require an EO and is legal for sale and use in all 50 states when installed with intact OEM emissions systems (EMS:4).

FAQ

Can I tune for high horsepower?
This long block is built for reliability under tow/haul duty. High-HP tuning is not recommended—nothing about this engine compromises drivability, but its spec prioritizes longevity over peak output.

What’s the advantage of solid flat tappets & adjustable rockers?
They remove hydraulic roller lifter complexity in newer architectures, stabilizing lash and eliminating a known failure point in long-idle, high-heat work cycles. You’ll perform periodic lash checks just like traditional heavy-duty valvetrains.

Is it truly drop-in for 2021–2024?
Yes—front cover/timing gear housing are year-correct so sensors, accessories, and mounts line up as expected. Always verify by VIN for mid-year changes.

Ready to rebuild your truck the right way?
Get the Precision Plus Long Block
6.7L Cummins Long Block Blueprinted Work & Tow Reliability First

Always follow the included installation instructions and torque procedures. Keep emissions equipment intact and compliant. If in doubt, consult a qualified technician.