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When your work truck or fleet vehicle drops a cylinder, every single hour it sits dead in a mechanic's bay is costing you money. For commercial operations, hotshot haulers, and busy independent repair shops, an engine failure isn't just a mechanical headache, it is a massive bottleneck to your revenue. While rebuilding an engine piece-by-piece or installing a bare long block might save a few bucks upfront, the hidden labor costs and extended downtime can easily wipe out those savings.

That is why demanding truck owners turn to a Full Running, Turn-Key Crate Engine. Arriving fully assembled, pre-timed, and sealed from the oil pans straight up to the turbocharger, a complete drop-in engine is designed to get your truck back on the road immediately. At Choate Engineering Performance, we carry our elite remanufacturing processes all the way through to the final external components, delivering a plug-and-play solution that leaves zero room for error.

The Risks of Component Swap-Over

When you purchase a standard long block, your technician is tasked with transferring dozens of your truck's old parts onto the new engine. In the heavy-duty diesel world, this "swap-over" phase introduces three severe risks to your investment:

• Debris Contamination: If your previous engine suffered a catastrophic internal bearing failure, metallic shrapnel gets pumped directly into the oil cooler. If a mechanic reuses that old cooler on a fresh long block without a flawless flush, those microscopic metal shards will cycle straight into your brand-new bearings, destroying the engine in the first few hundred miles.
• Timing and Sealing Mistakes: Modern diesel engines feature highly complex timing systems and massive sealing surfaces, like the multi-piece upper oil pan on the 6.7L. Misaligning a gear by one tooth or applying a bead of silicone incorrectly can cause structural oil leaks or internal engine contact.
• Sensor Fatigue: Reusing old, high-mileage sensors on a brand-new block means you are betting your engine's health on tired electronics. A single failing cam, crank, or oil pressure switch can trigger erratic running conditions or hidden damage.

What is Included in a Choate Full Running Engine?

Unlike simple "bare blocks," our Turn-Key 6.7L Powerstroke assemblies ship completely populated with all-new, critical components. You aren't just getting our precision CNC-machined, line-honed, and dynamically balanced rotating assembly; you are getting a fully dressed power package that includes:

• Premium Upgraded Turbocharger Assembly
• Brand New Water Pumps & Core Thermostats
• Heavy-Duty Oil Cooler & Fuel Filters
• OE Harmonic Balancer & Rigid Flywheel / Flex Plate
• Complete pre-sealed Upper and Lower Oil Pans
• All Essential Sensors Pre-Installed: Fuel Rail Pressure, MAP, Coolant Temp, Intake Air Temp, Exhaust Back Pressure, Oil Pressure Switch, Crank Position, and Cam Position Sensors.

Our Full Running Engine Configurations

We build our full-running platforms to match the exact workloads of your truck, keeping two premium packages ready for deployment:

The Full Running Daily Driver

Rated for 500+ Horsepower capability. This configuration is built for consumer towing, everyday driving, and reliable fleet management. It features our fully balanced rotating assembly, torque-plate honed cylinders for a perfect piston ring seal, and heavy-duty head studs. It arrives fully dressed with all-new external accessories so it can be unboxed, dropped in, plugged into your harness, and fired up immediately.

The Full Running Workhorse

Rated for 600+ Horsepower capability. This is the zero-compromise solution for the commercial hotshot or heavy fifth-wheel tower. In addition to the comprehensive turn-key components, the Workhorse upgrades the core infrastructure by adding O-ringed cylinder heads, a high-strength Billet Flex Plate, a Stage 2 Camshaft for enhanced thermal efficiency, chromoly pushrods, a welded cam gear, and our proprietary coated, flycut, and delipped performance pistons.

Choosing the Right Build Configuration for Your Truck

Navigating an engine replacement can be tough, which is why we offer our platforms in multiple completion levels to perfectly match your garage setup, mechanical comfort, and budget constraints: