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2006-2007 Duramax 6.6 LBZ

If you're a diesel enthusiast, then you've probably heard of the Duramax LBZ engine. Introduced in 2006, the LBZ quickly became one of the most sought-after diesel engines on the market. But what makes this engine so special? Let's take a closer look at the LBZ and find out.

First, it's important to note that there are two VIN codes for the LBZ. The first, VIN 2, was produced in late 2005 and early 2006. The VIN 2 engine is mechanically and physically the same as the VIN D engine but utilizes LLY engine tuning due to the LBZ tuning taking longer to be EPA certified and placed into production. The second, VIN D, was introduced in 2006 and continued into 2007 sold only in the "classic" body style. It has an improved engine computer tune that produces increased power and torque over the 2005 LLY version of the engine.

One of the reasons the LBZ is so popular is its strength and reliability. The engine was completely redesigned to enhance overall performance and reliability, with a number of changes made to strengthen the bottom of the cylinder bores and increase durability. Upgraded main bearing material was also used to increase the engine's strength.

In addition to its durability, the LBZ also boasts impressive power and torque figures. The engine tuning resulted in a significant increase in horsepower and torque, with the power levels getting a bump to 360 hp and 650 lb-ft of torque, up from 310 hp and 605 lb-ft of torque in the LLY. This makes the LBZ a great choice for those looking for a powerful and reliable diesel engine.

The LBZ is also pre-emissions, with the DPF appearing on the next generation LMM in 2007. This is another reason why the LBZ is so popular with diesel enthusiasts. With its lack of emissions equipment, the LBZ is a great choice for those looking to modify their engine for performance.

Some of the other changes made to the LBZ include a revised piston design that lowers the compression ratio, an increased piston pin bore diameter for increased strength, and a thicker connecting rod "I" section for increased strength. The cylinder heads were also revised to accommodate the lower compression and reduced cylinder firing pressure.

The LBZ also features a revised variable-geometry turbocharger that is aerodynamically more efficient, helping to deliver smooth and immediate response and lower emissions. The air induction system was re-tuned to enhance quietness, while the EGR has a larger cooler to bring more exhaust into the system.

The Duramax LBZ is one of the most popular diesel engines for a reason. Its combination of strength, reliability, and impressive power and torque figures make it a great choice for diesel enthusiasts. Whether you're looking for a stock engine or something to modify for performance, the LBZ is definitely worth considering.