[EagleChief]

Ok... so slight dilemma. I dropped off my cpu yesterday to the shop that is going to build me a new harness and flash the cpu and tune it. He called me late last night and said, "we might have an issue... your cpu is reading as a 2005 4.8L motor". But, the VIN I got from the salvage is from a 2003 5.3L. I've gone through the different scenarios, different cpu from a donor - but it was all hooked up when I got it delivered. Now, could they have hooked it all up to deliver it? Sure. But, everything looked like it hadn't been touched.

Now, I have a pic of the underside from when I swapped the pan out, and the crank has a cast number of "12552216". When I search that number, it appears as used on the 5.3, 6.0, 6.2L engines. Would that be a tell all sign, or do I still need to look at the piston heads to tell for sure? I'm going to see if I can rent a borescope from one of the parts stores to look for sure - hopefully, I can. Any other tell-tale signs that I can look for?

Maybe they sent me the wrong VIN # - I'm sure it can happen. But, how do I really tell what I have? Do I need a legit VIN to program the computer?