This is the final engine's cam-cover data tag, so if you've ordered a late-production '10 GT automatic, keep your eyes open for that final eight-digit number: 42395605. Will it go in the last 2010 GT built? Possibly, but not necessarily. As for the other data on the tag, the "REP" and "E1900" signify the Romeo plant, and the "260210," meaning February 26, 2010, is the day this engine's machined block started down the assembly line. That was a Friday, the plant doesn't operate on weekends, and we shot this mid-day on Monday, so the Three-Valve took some part of one workday to evolve from a bare machined block to complete assembly.