AMG GEP Optimizer long block

Notice: International buyers (this means if you do not live in USA) please request an invoice by email, include a list of parts you want and your address. We will look up shipping cost and email you an invoice.

Product Price USD 8,500.00

Product Description

Rough estimate of cost in USA is:

$8500 Optimizer.

$250 crate fee (unless you pick up in Franklin OH then a regular pallet can be used for $100)

$550-$600ish to your nearest R&L terminal or address with forklift or loading dock. (add $200 for lift gate service to your driveway)


Optimizers now come with a forged crankshaft (a $2000 part if bought separately).


This is the Optimizer long block. Known for it strength and reliability. These are the same exact long blocks used in our military Humvees.


These are brand new (not rebuilt) and have no core charge or core exchange needed. No shipping cost for you to ship a core back only to find out “your core is bad”!


These are a stronger block than GM castings were. This is the best option out there for most people. When you add the cost to rebuild a GM casting if you can find one that’s not cracked, its not worth it in my opinion unless all it needs is bearing, rings and seals. If the GM casting needs any machine work or has cracked web mains I advise just getting a brand new Optimizer.


I suggest some options to dress out a long block also. If you are spending this much you might as well protect it right. So first off is a Fluid Damper, then new injectors, the BF cooling system. After that Glow plugs. The rest of the donor parts like intake/exhaust manifolds will bolt on from any 6.5 or 6.2.


For break in of the engine I suggest oil changes and filter at 20-30 minutes then 500 miles then every 3000 miles after that.


You will need to email me a request to purchase with your mailing address and what application? (truck, Suburban, Hummer/van…ETC).

I will reply with payment info and a total price. You can then make a bank/wire transfer for payment. I can take a personal or company check or money order also. Funds obviously will have to clear before processing the order.  (sorry no PayPal or credit cards for payment on these) Email can be sent to


Typically a 4 week lead time on these plus a few days shipping. These can be picked up at the AMG warehouse in Franklin OH if you like also.

AMG/GEP offers no warranty expressed or implied as these are for military applications as a result LeroyDiesel LLC follows this policy. By purchasing you acknowledge and understand this policy. An optional warranty can be purchased though LeroyDiesel LLC. The option warranty is $1000 for six months and covers workmanship or factory defects of the Optimizer. More terms apply any questions contact us before proceeding.