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Top 10 6.6L Duramax Tech Articles

Engine mods rule for GM’s oil-burners.

Dec 7, 2020
Photographers: Diesel Power Staff
The third diesel engine in our tech article recap is GM's 6.6L Duramax, which came on the scene in 2001. The powerlant, code-named LB7, was the first modern-era oil-burner to feature common-rail fueling (Cummins didn't enter that arena in 2003), and it put out 300 hp and 520 lb-ft of torque.
In subsequent years, LLY (2004.5-2005), LBZ (2005-2006), LMM (2007-2010), LML (2011-2016) and, L5P (2017-present) engines were produced, with power and torque increasing for each one.
"Which Duramax is best?" is a question we're frequently asked. Because there are so many variants and they all have virtues, it's hard to declare one powerplant superior. For example, LB7s and LLYs do not have much emissions hardware and the desired quality for those who wish to modify. However, Duramax LBZ engines are extremely popular, because their performance—310 hp/605 lb-ft—can easily be increased because they also are void of much restrictive smog equipment. Later DMax engines "make more" power, but that typically happens after emissions equipment is bypassed.
Our Duramax-tech content is similar to the work we've done with 5.9L Cummins and 7.3L Ford Power Stroke engines. Here are 10 articles that focus primarily on the power side of modifying, because making gains in that space is really where it's at with Duramax engines.
Photo 2/11   |   002 Top 10 6 6L Duramax Tech Articles

Duramax Driveway Rebuild

 
Photo 3/11   |   003 Top 10 6 6L Duramax Tech Articles

Easy Air Bleeding

 
Photo 4/11   |   004 Top 10 6 6L Duramax Tech Articles

Rebuilding Duramax L5P

 
Photo 5/11   |   005 Top 10 6 6L Duramax Tech Articles

CP4 Injection-Pump Failure Explained

 
Photo 6/11   |   006 Top 10 6 6L Duramax Tech Articles

Big Power Gains for Duramax LMM

 
Photo 7/11   |   007 Top 10 6 6L Duramax Tech Articles

Displacement King

 
Photo 8/11   |   008 Top 10 6 6L Duramax Tech Articles

How It's Made: The DMAX Ltd Tour

 
Photo 9/11   |   009 Top 10 6 6L Duramax Tech Articles

Duramax Power Recipes

 
Photo 10/11   |   010 Top 10 6 6L Duramax Tech Articles

Inside Alternate-Firing Camshafts

 
Photo 11/11   |   011 Top 10 6 6L Duramax Tech Articles

Aluminum Heads Make a Big Difference

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