A couple of mysterious Chevrolet Silverado HD pickups have been spied undergoing testing in the United States. They appear to be testing a new diesel engine

A couple of mysterious Chevrolet Silverado HD pickups have been spied undergoing testing in the United States.

While the models feature a camouflaged front end, they don't appear to be facelifted variants as most of the bodywork is unchanged. The only noticeable difference is a camouflaged hood which has a large air intake. This suggests the prototypes are testing a new engine.

There's no word on what's under the hood but the red prototype has a prominent diesel sticker on the rear bumper. This likely means we can expect a new diesel engine to replace the 6.6-liter Duramax V8 that develops 397 bhp (296 kW) and 765 lb-ft (1,037 Nm) of torque.

 

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