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Thanks Westy. Looking at the mighty 6.5 TD in my new 2000 3500, the valve cover is embossed GM, which leads me to believe that all Chevy/GMC vehicles always had Moraine engines.

Did you or GM put that engine in your truck? The engine rebuilder article would lead you to believe that AM General was supplying the 6.5 to GM from 99 onwards. The Quote from the AMG GEP website below says they started mfg in 2000: General Engine Products (GEP) produces the OPTIMIZER 6500...

Thanks guys, that was exactly the info I was looking for. jwallers link to the Engine Rebuilder's article said it all: The older GM blocks are considered scrap by engine rebuilding pros. That is why we see all the pull-out HMMWV engines coming out of DRMO and not going back for rebuild.

Is there any reason to believe that current production AM General 6.5 L diesels are better, or more durable than those made by GM previously? Are the cranks still cast? I understand Navistar manufactures the raw engine castings for AM General. I would like to build a highly reliable 6.5 and...