RPO LB7 (engine code "1") was first introduced in 2001 and continued until early-2004. It is a 32-valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head.
SEE LB7 PRODUCTS BELOW
There are two VIN codes for the LBZ. The first is VIN 2. While it is the LBZ it has LLY tune tables.
Second is VIN D. This was introduced in late 2005 and continued into 2007 sold only in the...More Details »
The LLY (engine code "2") 402.7 cu in. turbocharged engine which debuted 2004.5 until the end of 2005. It is a 32-valve design with common-rail direct injection and aluminum cylinder heads. The...More Details »
The 6.6L RPO LML (VIN code "8") is the latest version (2011–2016) GM Duramax diesel engine and actually a further advanced version of the LMM engine with the majority of the changes addressing a...More Details »