The powerful V8 engines did so bearing the name LB7, and yes, they were eventually replaced by Duramax builds branded LLY.

Reliability is another of the Duramax’s strong points; a Duramax engine can be expected to last around 200-300,000 miles without major issues. In 2001, the 6.6-liter, 300-horsepower LB7 was the ...

General Motors’ 6.6-liter Duramax LB7 was a state-of-the-art V8 diesel engine with four-valves-per-cylinder producing 235 to 300 hp and 500 to 520 lb-ft of torque. In addition to a turbocharger ...