Stop in for a cup of coffee

toolmanmike said

Undisclosed powerplant. 6 liter is GM's biggest and I have not heard it's a diesel. Wonder what it's got?

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It is rumored to be the Caterpillar 3208 10.4L V8 diesel, in turbocharged form. It was used in variants of the Kodiak/Topkick on which chassis the Beast is reportedly built.