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Engine - New Longblock 6.5L Non Turbo NS ATO
Engine - New Longblock 6.5L Non Turbo NS ATO

Engine - New Longblock 6.5L Non Turbo NS ATO

Your Price: $8,416.54
Custom Drop Ship Delivery
Part Number:6504050ATO
  • Condition:New
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Assemble To Order (ATO)
Engine Preparation
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I understand that this product does not include a warranty.
New AM General - GEP Optimizer ™ 6.5L Diesel Engine - Non Turbo Naturally Aspirated Engine

This is the latest version of the 6.5L engine still produced new today. These are build-to-order engines in that your engine is run down the assembly line after order. Unfortunately, they are not built ahead of time and stored. Standard lead time to delivery is approximately 6-8weeks, sometimes less depending on assembly plant's load.

This engine has a lot of versatility in that it's a direct replacement for the many Non Turbo 6.5L applications used from 1994 - 2002 in C/K Trucks, Vans (G and P series), and some other applications. This engine was also used up to around 2010 is some P Series Delivery Vans. The replacement engine is also suitable for all 6.2L Diesel applications as an upgrade from the 1982-1993 135-155HP 6.2L engines to an updated engine that is capable of producing 170HP nearly smoke-free without a turbocharger with appropriate matching fuel injection components. This is the NS version of this engine which stands for Non-Spray in that the engines not have piston oil spray cooling which is perfect for non-turbo use while retaining great hot oil pressure for engines that see extended idle times.

Features & Included:

  • Engine Longblock Assembly (engine, timing cover, balancer, covers, pan, lift brackets, as pictured)
  • Forged Crankshaft (we've known this since 2019 just didn't publicize this to our competition)
  • Block Heater (120 volt)
  • Oil Filter (filter and filter fitting)
  • Oil Pressure Sensor/Switch pre-installed
  • Filled with 15w40 Break-In Oil
  • Natural Aspirated Cylinder Heads with fuel economy pre-combustion ports.
Engine features all metric fasteners, so if replacing a Pre-1999 model Engine, please inquire after purchase about a metric fastener kit after purchase necessary for replacing your existing engine (will need to know year/make/model). This is only available to customers who purchase a Longblock here. Approximately $95 shipped.


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.

In person production plant local pick up is an option that is available for those within driving distance of Franklin, Ohio USA. Only available to the named purchaser and by appointment. Coordinate this with customer service when item is ready for pickup. If item is not picked up and requested shipped after making this selection shipping can be arranged but with separate payment and a brokering fee applies.

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). This requires being sent to Unique Diesel for processing making it not possible to drop-ship from factory, this is part of the cost associated with this option.

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. This makes the engine have to come to us instead of being able to drop-ship. This is part of the expenses figured into the cost of the option.

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