2004.5-2005 LLY Duramax

Horsepower: 310hp, 520ft-lbs torque

The LLY Duramax Diesel Trucks

After years of LB7 injector issues GM introduced the LLY Duramax with its upgraded injectors located outside the valve cover.  These trucks don't suffer from the common injector haze from earlier generations.  With its rapid heat glow plug system and large variable vane turbo these trucks start excellent in the winter and can make some significant power with little modification.

Common LLY Duramax Problems

Overheating and blown head gaskets.  While head gasket failure often comes as a result of overheating the truth is the 2001-2006 Duramax head gasket has a weak design and doesn't plague ONLY the LLY trucks.  Pressurized cooling system, loss of heat in the cab, and coolant loss can all be related to failed head gaskets.

Solutions

While most consider the head bolt to be the reason for head gasket failure it is truly the head gasket design mixed with a poorly designed turbo mouth piece that is causing the issues.  Stocking quality head gaskets, top-end gasket kits, and fully rebuilt and upgraded Duramax heads on the shelf to fix your failed head gasket... we also offer intake and tuning options to help prolong your factory head gasket life.  We have the parts and the knowledge to get your truck running problem free.

---

Truck Generation Quicklinks

2001-2004 LB7
2004.5-2005 LLY
2006-2007 LLY/LBZ
2007.5-2010 LMM
2011-2016 LML
2016+ LWN 2.8L
2017+ L5P

View Duramax Service Main Page