Essential 2004.5 and 2005 Duramax Upgrades
LLY is the code used for Duramax motors used in 2004.5 and 2005 HD trucks. Although they introduced improvements from the 2001-2004 on the LB7 motor, there are a few essential upgrades every owner should consider. (That is assuming an LLY owner would want more power, lower EGT's and better efficiency.)
Before diving into the pitfalls of an LLY, here are a few of the improvements brought to market when they were released.
- Injectors outside of the heads provided much easier replacement
- Improved injector design much more reliable than its predecessor
- Variable Vane Turbo technology provides better spool up and wider power band
- Largest frame turbo of any Duramax motor to date
After years of testing this motor and countless upgrades, there are at least 5 essential upgrades every LLY could use.