The Duramax LBZ engine, a 6.6-liter turbocharged V8 diesel, delivers impressive performance in GM trucks. It produces 360 horsepower at 3,200 rpm and 650 lb-ft of torque at 1,600 rpm. Known for its robust design and tuning potential, the Duramax LBZ engine remains a favorite among diesel enthusiasts for reliability and power output in 2006-2007 models.