I was there,,,, worked for GM assembly in Wentzville Mo for 34 years. I maintain the machines that do alignment and aim the headlites,,,, and DVT(dynamic vehicle test,,,like a dyno). We now make Colorado/Canyon and full size vans. We're always the last to get good stuff. Don't remember the last year for the 6.5. Detuned Duramax repaced it. Detuned because the Allison won't fit under the floor. (4spd instead) Sooooo,,, it was a shutdown and all the complete built ones were gone but one and it was the last 6.5 to leave. Our repairmen had failed to get it runnin so they called a guy to fly in to fix it from the engine plant so it could ship. Spoke to him and he had a very high opinion of the engine he helped produce. He sounded sad we were't going to use them any more. We also made the last smallblock chevy (305ci.) Wrote an article for Hotrod,,, Steve Magnante said it would be in the Roddin at Radom section ,,, but they didn't use it.