Chevy convert 350 ci gas to 6.2 diesel sold to AMG's as 6.5

[It\'s a Dry Heat]

Please don't take this the wrong way. I wish I could get an H1. Where did the 6.5 diesel in the H1 come from? I know GM sold the 6.5 to AMG, but did it get its start from the 350 conversion to the 6.2 diesel. In 2005 when the Duramax and maybe Caterpillar engine comes out with Allison transmission. that will be a hell of a combination. I talked to a chevy HD truck owner and he said the engine and transmistion (cost him 12K)