For the ZR2, nothing. The Silverado's flagship off-road trim is available only with the Duramax and the 6.2-liter V-8, and Chevy's product planners see the latter as the natural upgrade.

This Chevy isn’t just about ‘Go’ either. It’s got plenty of ‘Show’ to delight onlookers. The paint is Cadillac Black Diamond and the cabin upholstery is Crimson Red. The body is devoid ...