The 2001 through mid model-year 2004 Duramax 6600 diesel engine was designated RPO (Regular Production Option) code LB7. The LB7 was introduced in the fall of 2000 with an industry leading 300 horsepower and 520 lb-ft torque rating. Not only was it the most powerful engine in this market...
The internals of the 6.6 Duramax were enhanced to provide additional durability. The cast-aluminum pistons were revised to lower the compression ratio. The forged steel connecting rods were also reinforced to handle the increased horsepower and torque. One of the main components to the increase in...
During the 2006 model year, the LBZ Duramax 6.6 diesel engine was introduced. The LBZ featured updates to the fuel system and turbo, along with a revised tune that resulted in a significant increase in horsepower and torque. In addition, the Allison 1000 transmission was redesigned and gained ...