Duramax Timeline

Duramax Horsepower & Torque by Model Year

The Duramax-Allison combination was first introduced for the 2001 model year, replacing the 440 lb-ft Detroit diesel with the 500 lb-ft LB7. Since then, the Duramax has undergone a variety of changes, modifications, and enhancements, all necessary in the progression and evolution of the engine. Today, the Duramax makes nearly 400 horsepower and over 750 lb-ft of torque while reducing emissions considerably over previous generations. The chart below follows the progression of the Duramax diesel, from the first LB7 to the more recent LML.

Model Year

Horsepower

Torque

Comments

2001

235 hp @ 2,700 rpm

500 lb-ft @ 1,600 rpm

LB7 introduced

2002

235 hp @ 2,700 rpm

500 lb-ft @ 1,600 rpm

2003

235 hp @ 2,700 rpm

500 lb-ft @ 1,600 rpm

2004

LB7: 300 hp @ 3,100 rpm
LLY: 310 hp @ 3,000 rpm

LB7: 520 lb-ft @ 1,800 rpm
LLY: 520 lb-ft @ 1,600 rpm

The LLY was introduced in 2004 and replaced the LB7 completely mid-year

2005

310 hp @ 3,000 rpm

520 lb-ft @ 1,600 rpm

2006

LLY: 310 hp @ 3,000 rpm
LBZ: 360 hp @ 3,200 rpm

LLY: 605 lb-ft @ 1,600 rpm
LBZ: 650 lb-ft @ 1,600 rpm

The LBZ was introduced in 2006 and eventually replaced the LLY by 2007. The 2006 LLY featured many changes to boost torque.

2007

LBZ: 360 hp @ 3,200 rpm
LMM: 365 hp @ 3,100 rpm

LBZ: 650 lb-ft @ 1,600 rpm
LMM: 660 lb-ft @ 1,800 rpm

The LMM was introduced mid-year 2007 and replaced the LBZ

2008

365 hp @ 3,100 rpm

660 lb-ft @ 1,800 rpm

2009

365 hp @ 3,100 rpm

660 lb-ft @ 1,800 rpm

2010

365 hp @ 3,100 rpm

660 lb-ft @ 1,800 rpm

2011

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

Duramax LML replaces LMM

2012

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

 

2013

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

 

2014

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

 

2015

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

 

2016

397 hp @ 3,000 rpm

765 lb-ft @ 1,600 rpm

 

2017

445 hp @ 2,800 rpm

910 lb-ft @ 1,600 rpm

Duramax L5P replaces LML for 2017 model year