2005 Model year had the 5.3 "Vortec 5300 engine".
The 2006 model year had the LS2 6.0 in them. The LS2 is a great engine, it has the LS6 heads with a smaller cam and soduim filled valves. Also the LS2 doesnt blow up like the LS3 does on a track. With a cam, truck intake, and tune you can build a TON of power on these.
On a side note, these still are the best vehicles that GM ever built as far as fit and finish goes.
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