Complete crate engines are the most turnkey of all the engine alternatives, containing components such as intake and exhaust manifolds, fuel injectors, and even a turbocharger. ![]() A long block takes the base small block package and adds top-end components such as a camshaft, valvetrain, and complete cylinder heads. The block and rotating assembly with a crankshaft, connecting rods, and pistons make up what is referred to as a small block. XDP has the exact Duramax you need for your truck, whether you want a short or long block. XDP offers engines from industry leading brands such as Diamond Advantage and DFC. Whether you use your truck for towing and hauling heavy loads or as a daily driver, XDP has the perfect engine for you. Crate engines are available for the Chevrolet Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD, as well as the GM Express/Savana Vans. ![]() XDP offers a wide selection of remanufactured 2006-2007 GM 6.6L Duramax LLY/LBZ engines to choose from. I'll let you know about this '21 once I get a few miles on it.Don’t wait a few weeks or months for your local machine shop to rebuild your tired or failed engine. Jus another tool for you to evaluate the truck you are considering. The average speed when I traded it in was 44MPH. My 2017 for example was used mainly in the summer months on road trips and was not a daily driver in the winter months. High average speed indicates a truck that was used on the highways on trips where it maintained higher speeds. Low average speed may indicate the truck was left idling or used around town as a daily driver. You can get a good idea how the truck you are considering was used by dividing the engine hours into the mileage and get an average speed of the truck over it's life time. I have not seen this posted anywhere before so I will share it for those looking for a used Duramax. Overall I don't think you can go wrong with the Duramax. Realize this is an older thread as I was looking for info on the '21, but wanted to share my reason for loving these trucks and yes I have not had the nightmares others have suffered or my opinion might be different. I could have kept the 2017 another few years, but why wait at these values. You just can't beat the Duramax for holding value. I just traded my 2017 Duramax with 49K and got $53K trade in value and walked away with a fully loaded 2021 LTZ, tax, license and 10-year extended warranty and rebates for $21K out of my pocket. It makes it easy to trade up when you get so much value on a trade in. If you wonder why I trade them in every 4-7 years is because these trucks are in high demand and really hold their value like nothing I have ever seen in my lifetime. I do a lot of towing going to car shows all over the country in the summer months (I am retired) and the Duramax has never failed me, not even a flat tire (knock on wood). Arriving this week, maybe today and can't wait to run that 10-speed Allison through the gears. ![]() That truck got 22MPH when not towing with cruise on set at 70MPH. Traded that in on a '17 and only issue was leaking OnStar antenna on the cab. Traded that in on an '12 and had a couple sensors replaced. Traded it in on an '07 which was a great truck, no issues at all. I had an '01 and solved the injector issue with a Cat Filter first out of the tank, then on to the OEM filter which was not a good filter and allowed a lot of junk through to the Injectors before I added the CAT filter. I have not had a bad one, a few small issues easily solved under the warranty or a solution found on this and other sites from members who always help.
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