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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

2025 GMC Yukon AT4 teased, will likely follow 2025 Suburban template

It's time to begin teasing the 2025 GMC Yukon, the luxury truck division doing so with a glimpse of the front fascia on the AT4 trim. This being a refresh, we're not looking for major changes to hard points. In contrast to today's Yukon, it seems the new face will stress horizontal breadth instead of highlighting the central aspect of a giant grille and skid plate area. Starting with the taller C-shaped headlights on the 2025, a shorter horizontal element at the top no longer reaches all the way to the grille surround, and it's separated from the three main beams below by a body-colored piece extending from the grille cradle. Below the light, a new lower bumper treatment probably increases the aggression compared to today's truck. Instead of black centerpiece that houses the skid plate and a pair of tow hooks, it appears the entire bumper will be black and wrap around into the fenders. Finally, the grille looks the same, but its crossbars have been reprofiled.  As sibling to the 2025 Chevrolet Tahoe and Suburban that Chevy revealed last November, we expect many of the same updates here. Outside, that would mean refinements to the independent rear suspension for more nimble handling, new wheel designs, and availability of the second-generation 3.0-liter Duramax inline-six with 305 horsepower and 495 pound-feet of torque instead of today's 277 hp and 460 lb-ft. Inside, we expect a new instrument panel housing a 17.7-inch touchscreen for infotainment, and a column shifter replacing the push buttons on the center console. Updated trim materials — along with the overdue infotainment upgrade — should provide a finer sense of luxury than what's currently on offer.  If tech treats carry over, buyers will have access to the Connected Cameras feature for viewing and recording inside and outside of the vehicle for crash and security purposes. An Interior Motion Detection system can detect "micro-movements" in the cabin that could signal a baby or a pet left in the vehicle.  The Yukon might go further than the Chevy SUVs, seeing that GMC has some birthdays to celebrate: 2024 is the fifth anniversary of the AT4 trim and the 25th anniversary of the Denali trim. We'll find out later this year, GMC promising the Yukon reveal sometime after the new Acadia begins shipping to dealers.

2023 Detroit Auto Show recap | Autoblog Podcast #798

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor John Snyder and Road Test Editor Zac Palmer. The team attended the 2023 North American International Auto Show in Detroit this week, and have some thoughts about the reveals. They discuss the 2024 Ford F-150 (including the Raptor models), 2024 Jeep Gladiator, 2024 GMC Acadia and 2025 Cadillac CT5. Ford held a Mustang-focused event, and we talk about the Mustang Mach-E Rally and Mustang GTD. Finally, the hosts opine about the general vibe of the Detroit Auto Show, and whit it means for auto shows in general. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #798 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown 2024 Ford F-150 revealed at Detroit Auto Show: New tailgate, more screens and fresh looks 2024 Ford F-150 Raptor gets trick suspension and other upgrades 2024 Jeep Gladiator debuts with new interior, more options and trim levels 2024 GMC Acadia gets bigger, goes entirely turbocharged 2025 Cadillac CT5 revealed with updated looks and tech Ford Mustang Mach-E Rally coming to a trail (and showroom) near you 2025 Ford Mustang GTD revealed as a race car for the road General thoughts about the show Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: Quick look at the 2025 Ford Mustang GTD