100% BRAND NEW

6.5L NEW GEP Longblock Diesel Engine

Manufactured by General Engine Products (a Division of AM General) in the USA

Time to replace the engine in your 6.2L or 6.5L GM? These engines come off the same production line in Indiana, USA that builds the engines for the US Military Humvee program and are the best 6.5L engines ever produced. The heads and blocks are cast in the USA and updated with modern metallurgy and additional reinforcement in failure prone areas to prevent the cracking problems that the 6.2 / 6.5's are famous for.  Additionally the crankshafts are now forged to eliminate the crank breakage problem that has long plagued this engine platform.

We have witnessed way too many customers over the years spend thousands of dollars on machine work and engine parts to rebuild their engine only to experience a broken crank or cracked block a few thousand miles later. Updating to a modernized Optimizer 6500 from GEP is usually the best way to go and will pay dividends in peace of mind since there will be no worries about crank breaking or block cracking at any moment.

Other features:

- Improved coolant flow through cylinder heads and around the valves

- Induction Hardened valve seats

- Comes filled with break-in oil

- Complete with oil pan, oil pump, valve cover, timing cover, harmonic balancer, lift brackets, and oil filter

- Block-heater comes pre-installed

These 6.5L GEP Longblock Diesel Engines will replace any 6.2L engine with minimal changes. (All GEP engines require metric thread fasteners in all locations. GM engines before 1999.5 used standard fasteners in a few positions, so  it may be necessary a acquire a few metric fasteners when replacing an early engine.)

Both side mount turbo engines (pickup application) and center mount turbo engines (vans and Humvees are available).

We keep these engines in stock for immediate shipment, with no waiting for production as with many other dealers. You are also welcome to come visit us and pick up your engine in person. Please call ahead to make arrangements. We get great freight rates and will contact multiple carriers to get you the best rate if you opt to have your engine delivered. If you are able to have your engine shipped to a business with a forklift or loading dock, there will be substantial savings.

Since these engines are built with military use intent (Humvee program), AMG /GEP does not offer any express or implied warranty on engines sold to the civilian community. This is hardly a concern since these engines are built to the strictest military standards and specifications. We have yet to see or hear of a legitimate failure on a new GEP engine.  These engines are battle tested and proven by the USA military and by the defense departments of many of our allies around the world.

Unfortunately, we are unable to accept credit card or paypal payments for engines. Payment can be via wire transfer, check, or cash if picked up in person.   Shipments will be delayed for bank clearance on payments made via check.

Since these engines are 100% new with NO used or remanufactured parts, there is NO core charge and no hassles with shipping back an engine core! (Consider this when comparing to the cost of a reman engine. Core charges and the cost of core return shipment can be high and many 6.5L engine cores will not be accepted by the rebuilder due to cracking resulting in the loss of the core deposit.)

Feel free to call or email with any questions. If you are interested in making a purchase, feel free to email us your delivery address info and we can search for the best possible rate on freight to your location. Freight can be as low as $250 - $350 for a business location with a loading dock or forklift. Please call or email to make arrangments before placing an order. Thank you!

High-Quality 6.5L NEW GEP Longblock Diesel Engine for Trucks

Plan Around the Longblock

The 6.5L NEW GEP Longblock Engine provides a new foundation for an engine replacement without requiring you to replace every surrounding component. Before removing the original engine, identify which external parts you will reuse and assess their condition.

AccurateDiesel.com also offers diesel parts and accessories for completing work on older diesel applications.

Inspect Reusable Components

An engine swap provides access to areas that are normally difficult to reach. Take advantage of that access to inspect reusable components before transferring them to the 6.5L NEW GEP Longblock Diesel Engine. Finding a worn component during the swap is far easier than discovering the problem after the replacement is running.

Review the product at AccurateDiesel.com before starting your replacement project. Once you've decided, add the 6.5L NEW GEP Longblock Engine to your cart today.

Frequently Asked Questions

• What does a longblock replace?

  A longblock contains the engine's primary internal assembly, but it does not replace every component under the hood. Review what is included and determine which parts must be transferred or supplied separately.

• Should I inspect my old engine before removing it?

  Yes. Document the existing setup and identify parts intended for reuse before removal. This provides a useful reference when preparing the 6.5L NEW GEP Longblock Diesel Engine.

• How should I handle reusable parts?

  Inspect each reusable component for damage or excessive wear before transferring it. This helps prevent an older problem from carrying over to the new 6.5L NEW GEP Longblock Diesel Engine.

• Does a new longblock make the other parts new?

  No. Components retained from the original vehicle still have their existing age and service history. Inspect them carefully before completing the replacement.

• What should I verify before ordering?

  Confirm the vehicle application and compare its existing configuration with the product information. Also determine which components you plan to reuse during the project.