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Hi people. I'm new to this forum and hate to ask for help, but idk what to do. I purchased an older truck from an auction a few years ago. I hardly use the truck, but for moving gravel or quads, I just needed it since I can't do this with my VW bug. The problem started with realizing after I purchased the truck that there's been some rebuilding, and for a while now, I've been getting knock sensor codes (ie. low input P0332 and P0337). I changed them out last year with some lower end sensors + harness, but the codes returned, so I changed them out again recently with ACDelco and a new harness, and again the codes are reappearing. Now I'm wondering, although the Sierra 2500 (2006) came with a 6.0 vortec, is it possible that this engine has been swapped with a 5.7? I saw 5.7 written under the hood when I first bought it, but never thought much about it, and now I'm just not sure. I've looked on the front of the (leftside) head, but there was only a 4 letter code that didn't id anything. There were some numbers on the cylinder, but again, nothing comes up doing a search for them (ie. zero hits on google). I've heard that the engine number should be stamped somewhere near the rear of the engine, but I can't see anything. So where should I look for the engine's serial number? I know the engine is a vortec engine (as the plastic cover above the manifold indicates), I just want to make sure. If this is a 6.0, then maybe I will need to look at the PCM 'knock module'. If this is actually a 5.7, I think I may need to order different knock sensors (?) I'm not sure and could use some help. This is a picture of the leftside engine in front of the cylinder head. I think it reads D224? I'm not sure.

I'm looking over the intake manifold and noticed that a piece of it is melted. I'm neither its function or what it is. This is the picture of the piece. It's not my picture; like I wrote, the one on my intake is melted in. Someone looks like they may have plastic welded it? I'm not sure. Maybe this is related to the knock sensor problem? Will I need to order a new intake manifold? Here's another picture.

Need help identifying this "module" (or whatever it is). It's mounted vertically on the outside of the frame rail, between the two doors on the passenger side. (see images) The purpose for identifying is for relocation. I want to mount a compressor against the frame here and the module is in the way. Was thinking about adding holes to the bracket and attach the module to the bracket after it's mounted. Would there be any issues mounting this module horizontally, instead of vertically?