4.5L VT275 Engine

VT275 Engine Bare Long Block

Remanufactured 4.5-Liter VT275 Engine – Bare Long Block – Built to Factory New Specifications with Updates – Diesel Experts

SKU: VT275 Long block Categories: , ,

Product Description

The VT275 Engine is a 4.5 L V-6 engine, with a bi-turbo  setup similar to the 6.4-L PowerStroke or MaxxForce 7. You could call the VT275 engine the cross over engine from the VT365 to the MaxxForce 7 Engine because it has the sequential twin-turbocharger system of the 6.4-L PowerStroke or MaxxForce 7 engine and the block design and setup of the VT365. The VT275 Engine was used in the Ford (Low Cab Forward ) LCF 450 & LCF 550, International (Cab Forward) CF500 & the WorkHorse Chassis.


The VT275 engine however was plagued by the same issues that it’s big brother the 6.0-L PowerStroke or Vt365 had. The EGR Coolers commonly fail from it becoming super heated and then it starts to come apart inside the unit. When this happens the VT275 engine starts ingesting coolant from the leaking EGR Cooler. Once this happens the Electronic Control Module detects that the fuel is not the correct ratio and then corrects for it thus injecting more fuel. From there you get an over fueling situation which causes injector problems, head gaskets or catastrophic engine failure. Fortunately our guys at BulletProof Diesel have devised an updated EGR Cooler for these vehicle as well to alleviate these issues. The Straight Through Flow The factory oil cooler needs to be replaced at the same time as the new EGR Cooler is as well.

Once these issues have been taken care then these engine can continue to be a reliable service vehicle in the field. 75% of the core returns from the remanufactured engines that we supply the cores come back attributed to these failures.

Additional Information

Weight 835 lbs
Dimensions 48 x 48 x 40 in

2006, 2007, 2008, 2009, 2010


Ford, International, MaxxForce, Workhorse


Cab Forward, CF500, CF600, CityStar, LCF450, LCF550, Low Cab Forward, Strip Chassis, VT275

Engine Size



Silverado 2500HD

Silverado 3500HD

Sierra 2500HD

Sierra 3500HD

Kodiak C4500

Kodiak C5500

Topkick C4500

Topkick C5500


To determine the correct application for your vehicle please gather the VIN (Vehicle Identification Number). 

If you have a C4500 or C5500 additional information will be needed to determine the correct engine.


  • Assembled in the USA.
  • All the internal wearable parts such as bearings, gaskets, pistons are replaced with New.
  • Cylinder Blocks and Cylinder Heads are magna-flux tested to avoid micro fractures.
  • Cylinders are bored back to Original Equipment Specs, or sleeved.
  • 100% Standard sized crankshafts are used in these engines, no reground and re nitrated.
  • Cylinder heads get new valves and are vacuum tested to ensure the quality of the valve job. All heads are then pressure tested.
  • Connecting rods have new bushings installed and both large and small end are re machined to OEM specifications and gram weight.
  • New high pressure GM oil pumps are used for durability
  • Core plugs are 100% stainless steel to avoid corrosion.
  • 100% internal wear components including rings, bearings, bushings, gaskets and seals.

Technical Specs

Engine: 6.6L Duramax,  90 degree V-8 diesel

Years Produced: 2001 – Present

Displacement: 403 cubic inches, 6.6 liters

Head/Block Material: Aluminum cylinder heads, cast iron engine block

Firing Order: 1-2-7-8-4-5-6-3

Bore: 4.06 inches

Stroke: 3.90 inches

Aspiration: Turbocharged & intercooled

Injection: Direct injection, Bosch high pressure common rail with injection pump

Valvetrain: OHV (overhead valve), 4 valves per cylinder (32 valve)

Oil Capacity: 10 quarts w/ filter

Engine Weight: Approx. 835 lbs


The 6.6-L Duramax Bare Long Block Engines come with a 18 Month Unlimited Mileage Parts Replacement Warranty.
Labor is covered at book rate times for manufacturing defects.


Shipping is handled via common freight carrier. Freight is calculated by zip code and weight of the engine round trip unless specified differently.