GMC teases next 2017 Sierra 2500HD, but what lies beneath its new hood scoop?

Here's what we don't know about the 2017 GMC Sierra 2500HD: What's under its hood. What we do know, however, is what that hood will look like. For the first time, a big, chrome hood scoop occupies center stage above the truck's signature (and massive) chrome grille. You can't miss it. Look beyond the scoop and you'll see a new, larger, and...

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