I'm selling the corp's 2009 Silverado. We got in in partial trade for some work and I wasn't in on the deal, so I didn't know what they were getting. I haven't paid a lot of attention to it other than making sure it got maintained on a decent schedule. I need to describe it in the ads but I don't know zip about Chebby motors. Can anyone ID this engine for me, or tell me what to look for so I can ID it myself?