Originally Posted by Jubuloo
Thanks Peteg59 and Jolly Roger for your help! Unfortunately there aren't any photos of the underbody but I'm planning on going to test drive and will def check for that. I ran the vin and everything matched up with the advertisement but I'll take it to a shop if possible. The body looks fine and it's a 6.5L V8 FI DSL TURBO engine with 4A W/ OD transmission.
To clarify, you said a 6.5? Not a 6.6? The 6.5l while a decent powerplant, is not turbocharged in the van chassis as there's physically no room to hang the turbocharger off the side as it is in the other GM platforms that used the engine. That it shows up as turbocharged is most likely an oversight on the part of the vin decoder.
It is also not as resilient as the 6.6l Duramax, any of the Powerstrokes, or the Cummins. They typically do not last as long either, often wearing out at around 250,000 miles give or take depending on how well they're cared for. They do not appreciate being even slightly overheated, head gasket failures are not rare. The engine was largely designed to be an economic alternative to a big block gasser, though they can be found in a wide variety of applications from boats to humvees.
I heavily recommend a fuel lubricant additive with the 6.5l, the injection pump wears over time and they're starting to get really expensive and the number of people able to diagnose and repair these engines when something goes wrong is shrinking. I've learned this first hand unfortunately.
Be wary that these trucks use mechanical odometers and it's possible it may have had the cluster swapped due to a failure. Definitely check this engine for blowby.