[Splicerguy]

Here's what I see;

If you look at the close up shots of the tach, it seems to redline at 6000 rpm. The LS3 makes peak power at 6k rpm, so if this is the V8 it's not an LS3. The L76 makes peak power at 5600 rpm, so that's within the tach but awfully close to the top. The V6 makes peak power at even higher rpm, 6300.

So, this is probably a V8. It's probably not an LS3. That leaves the L76 and Gen V for options. There's not enough info about the Gen V to guess any further. So I'm thinking the V8 choices are down to 2.

Edit: Just checked the DI 3.6 and it peaks at 5200, so add 1 more possibility.