The LBZ Duramax was introduced in late 2005 and put into vehicles through 2007. This 6.6 liter V8 turbo diesel was put in the Chevy Silverado HD and the GMC Sierra HD. Even with its short production time span, the LBZ earned a reputation that still stands strong to the day: the power, reliability and unmatched durability.

It was built through a partnership between GM and Isuzu. The LBZ featured a cast iron block and aluminum heads. From the factory it produced 360 horsepower and 650 lb-ft of torque, impressive numbers for its time. The engine paired with the Allison 1000 six speed automatic transmission, giving the strength and smoothness that diesel trucks demanded.

One of the biggest reasons the LBZ is so loved is its balance of power and simplicity. It came before the more restrictive emissions systems that newer models had to meet. That means fewer components to fail and more freedom for modifications and tuning. It also included stronger internals, which made it more capable of significant performance upgrades without major modifications.

Whether it’s used for towing, racing, or daily driving, the LBZ has proved itself to be a reliable workhorse. Even today it is praised for its high horsepower capability and reliability.