Wrong LS engine? No start
I have a custom conversion where I was told the engine was a 2011 6.0 from a gmc savanna 3500.
Looking at the intake manifold, it has a build date of march, 2008.
Any pointers on what to check to correctly identify the year of this engine?
I have had the ecu programmed for a 2011, but I assume if this was actually a 2008 or 2009 engine it might not run on the 2011 computer.
I had been getting codes for the pedal and MAF. Could this be due programming or pinout differences?

