Chevrolet Silverado HD Spied Testing Updated Engines [Updated]

Jason Siu
by Jason Siu

A heavily disguised Silverado HD was caught by spy photographers, suggesting that Chevrolet is working on updating the gasoline-powered version of the big pickup.

Update: Another spy photographer has reached out to us and pointed out there’s a diesel exhaust fluid (DEF) tank below the passenger-side door and the rear exhaust has a Venturi tip, which means this prototype is a diesel model. It’s possible, as a commenter below has noted, that Chevy is testing the diesel Silverado HD with plugged air inlets to see how it performs. The original story appears below.

The Chevrolet Silverado HD received a 2017 model year mid-cycle facelift, but the major change was under the hood with GM overhauling its Duramax diesel engines featuring Ram Air hood scoops. At the time of the mid-cycle refresh’s introduction, the standard gasoline engines didn’t see any major changes, but it looks like Chevy is working on it.

Based on the camouflage seen on this prototype, it appears GM is testing updated gasoline engines for the Silverado HD since there’s no indication of any air inlets on the hood camouflage to feed Ram Air scoops.

SEE ALSO: 2017 Chevrolet Silverado HD Adds Redesigned 6.6L Duramax Diesel

But without actually peering under the hood, we can only speculate on what Chevy is working on for the updated Silverado HD. The American automaker is reportedly developing new technology for its next-generation engine, an advanced “displacement on demand” system, based on equity investments made to a Silicon Valley firm called Tula Technology, Inc. Our spy photographers say the new system uses what’s called Dynamic Skip Fire (DSF) technology, which promises to deliver the right amount of horsepower and torque needed for the current driving conditions. This allows the engine to conserve as much fuel as possible.

It is believed DSF will improve fuel economy by as much as 15 percent and won’t feature the same traditional vibration issues with conventional cylinder-deactivation systems.

Discuss this story on our Chevrolet Silverado Forum

Jason Siu
Jason Siu

Jason Siu began his career in automotive journalism in 2003 with Modified Magazine, a property previously held by VerticalScope. As the West Coast Editor, he played a pivotal role while also extending his expertise to Modified Luxury & Exotics and Modified Mustangs. Beyond his editorial work, Jason authored two notable Cartech books. His tenure at saw him immersed in the daily news cycle, yet his passion for hands-on evaluation led him to focus on testing and product reviews, offering well-rounded recommendations to AutoGuide readers. Currently, as the Content Director for VerticalScope, Jason spearheads the content strategy for an array of online publications, a role that has him at the helm of ensuring quality and consistency across the board.

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2 of 8 comments
  • Frank Yoster Frank Yoster on May 10, 2017

    Again? Dang chevy must be intimidated by ram and ford

  • Matt G Matt G on May 10, 2017

    I think the DEF tank is fake. My DEF tank is under the passenger door. This one looks under the rear passenger door. I think they are going to get rid of the DEF tank in its current location. All I can say is that it looks fishy.