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Engine - New Longblock 6.5L Side Mount Turbo RFN
Engine - New Longblock 6.5L Side Mount Turbo RFN

Engine - New Longblock 6.5L Side Mount Turbo RFN

Your Price: $8,972.54
In Stock.
Part Number:6504052
  • Condition:New
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Engine Preparation
Shipping Crate Type
Metric Fastener Kit
Freight Delivery Option
I understand that this product does not include a warranty.
New AM General - GEP Optimizer ™ 6.5L Diesel Engine - Side Mount Turbo Truck & Suv - Rapid Fulfill Now (RFN)

This is the latest version of the 6.5L engine still produced new today. Available through our Rapid Fulfill Now service where longblock engines are kept in stock and when not in stock you can save on the long lead time of producing one as units are already in the process of being built to replace missing stock. When not in stock expect a 2-4 week lead time (much shorter than the 6-8 weeks on ATO engines).

This engine can replace virtually all 6.5L side-mount turbo applications used in 1992-2002 models ranging from trucks, Suburbans, Blazers, Tahoes and more.

Features & Included:

  • Engine Longblock Assembly (engine, timing cover, balancer, covers, pan, lift brackets, as pictured)
  • Forged Crankshaft
  • Block Heater (120 volt)
  • Oil Filter (filter and filter fitting)
  • Oil Pressure Sensor/Switch pre-installed
  • Filled with 15w40 Break-In Oil.
  • HD = Heavy Duty Emissions Rating
  • Diamond Pre-Combusion (largest) Cups for higher HP ratings
Engine features all metric fasteners, so if replacing a Pre-1999.5 model Engine. Select the Metric Fastener Kit that matches your application, only available for purchase with a long lock.


These new long blocks carry no warranty. The manufacturer provides no warranty on these engines. Unique Diesel provides no warranty on these engines. Warranty coverage is not an option on these engines and is a term of the manufacturer. We are being up-front about the limitation which is more than can be said for other potential sources.


This item is available for purchase via traditional payments and credit cards with courtesy fee for USA customers. Must select Credit Card Courtesy on this product if you will be using a credit card on the final checkout page. International customers can not use a credit card for this item, please request the use of a traditional checkout method.

Both USA customers and International customers can utilize the optional traditional payment method for this product which can save money (no Credit Card Courtesy Fee). Please contact customer service for access and guidance in using traditional checkout method for the store.


Select the shipping option that meets your need. Items with shipping amounts are for Continental USA shipments only. Flat rate shipping is provided as courtesy and we cannot provide alternative shipping estimates, please select an option provided. We do not provide quotations for export shipments outside of the USA, but will ship to your USA located freight forwarder using the rates provided. Please source a capable Freight Forwarder in the USA that we can ship to, they can then ship to your country. Take note of the engine preparation requirement for export engines where the forwarder uses Air Freight.

Shipping will be performed in a secure shipping crate, exactly as pictured. Engine is safest shipping in this method!

Engine Preparation Options

If unit is being shipped via Air Freight the engine must be free of oil, new engines come with break-in oil in the pan, so engine must be un-crated and drained of oil and a new filter installed (that is dry).

Addition of timing tab for mechanical engines. The factory cannot modify this assembly as it's intended for electronic engines. We can optionally add the mechanical timing tab to the front of the engine's timing cover with special tooling and have it match TDC for timing with timing lights, We do this and add the plug in the timing cover to delete the crank sensor opening.