The first is VIN 2 produced in late 2005 and early 2006.
Injection: Bosch High Pressure Common-rail. Block / Head: Cast gray iron / Cast aluminum. The following trucks used the LLY engine: Learning from problems with injectors in the previous LB7, GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary. To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR Valve. The LLY was GM's first attempt to implement emissions requirements on their diesel trucks. 
It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The LLY (internally called the 8GF1) (engine code "2") is a 6.6 L 403.9 cu in (6,619 cc) turbocharged engine which debuted in mid-2004 and continued until the end of 2005 (except the Hummer H1 in 2006). The LLY was introduced in 2004 and replaced the LB7 completely mid-year
Injection: Direct Bosch high pressure common-rail. It is a 32-valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head. RPO LB7 (engine code "1") was first introduced in 2001 and continued until early-2004. On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V8 at its Moraine facility, followed by the 2,000,000th on March 24, 2017. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. This engine was initially installed in 2001 Chevrolet and GMC trucks, and has since become an option in pickups, vans, and medium-duty trucks. The Duramax block and heads are supplied from reliable vendors of General Motors. The Duramax V8 engine is a family of 6.6 liter diesel V8 engines produced by DMAX, a joint venture between General Motors and Isuzu in Moraine, Ohio. High-pressure common-rail direct injection Garrett variable-geometry vane with intercooler
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