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2. Duramax V8 engine - Wikipedia

   en.wikipedia.org/wiki/Duramax_V8_engine

   There are two VIN codes for the LBZ. The first is VIN 2 produced in late 2005 and early 2006. The first is VIN 2 produced in late 2005 and early 2006. The VIN 2 engine is mechanically and physically the same as the VIN D engine but utilizes LLY engine tuning due to the LBZ tuning taking longer to be EPA certified and placed into production.