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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 Terrain fully revealed in spy photos

A couple of months ago, GMC teased the 2025 Terrain compact SUV and said there'd be a reveal sometime this year. We're still waiting on the official reveal, but in the meantime, a spy photographer caught the GMC out and about without any coverings. So this is an early look at the Terrain, both in AT4 and Denali trim levels. Being a mechanical twin to the recently revised 2025 Chevy Equinox, there are some similarities in the roofline, the prominent C-pillar and the window lines, but beyond that the Terrain continues to be solidly distinguished from the Chevy. The front has GMC's more vertical headlights and tall grille, with the latter getting a unique black surround. The fender flares are given more prominence, particularly from the signature amber marker lights over each wheel, and there are subtle taillight and bumper changes. There are design differences between the AT4 and Denali, too. The AT4 has black contrasting flares and bumpers, whereas the Denali has body color pieces. And the AT4 has tow hooks and smaller wheels with all-terrain tires. The Terrain really differentiates itself from the Equinox inside, though. It trades the more organic, trapezoidal Chevy design for the crisp, rectangular looks of larger GMC models. Complementing the look is the touchscreen in portrait layout compared to the Chevy's landscape unit. We don't know for sure whether this screen will be standard across the lineup (the photo is of a Denali), but considering GM's willingness to include big screens in all its models, we wouldn't be surprised if this is included even on base Terrains.  Underpinning the Terrain will be the same new platform as Equinox, and almost certainly the same turbocharged 1.5-liter four-cylinder with 175 horsepower. Front-wheel drive and all-wheel drive should be on offer, with the former getting a CVT and the latter an eight-speed automatic. The AT4 model clearly has reworked bumpers for better approach and departure angle than the standard Terrain, and probably has some additional light protection. We'll be curious if GMC offers a twin-clutch rear differential for some locking and torque-vectoring functionality to help it stand out and potentially compete with the likes of high-end Bronco Sport. But that's more in the realm of speculation. We should have confirmation of many of these details and much more soon when GMC officially reveals the Terrain itself.

Cadillac Celestiq, Lyriq, Hummer, other future GM electric cars: Here's everything we saw at ‘EV Day’

WARREN, Mich. — Today, General Motors held an “EV Day” event at its Warren, Michigan, campus to present its new “Ultium” battery technology, modular electric vehicle architecture and soon-to-come electric vehicles. Unfortunately, we were forbidden from bringing cameras into the event, so while we canÂ’t show you what we saw, we can tell you more about it. While we saw the previously teased Cadillac EV (which we now know to be called the Lyriq) and the GMC Hummer pickup teased during the Super Bowl, there were a number of other future cars at the event, which GM President Mark Reuss assured us are all real vehicles in the works. The biggest surprise came at the end of the event, though, in the Cadillac Celestiq electric sedan, which Reuss described as a future flagship that would be hand-built “very locally.” It had been hiding under a dark sheet all morning, with the front and rear illuminated Cadillac emblems shining from underneath. When the wraps came off, we saw a long, white, four-seat fastback sedan. The 23-inch wheels were pushed out to the very corners of the car, giving it what appeared to be a very long wheelbase. The model on the stage had no side mirrors or visible door handles. The grille mirrored that of the Lyriq crossover next to it, with integrated lighting in lieu of the usual mesh or slats youÂ’d see in an internal combustion car. The entire roof, all the way until it tapered to the tail of the vehicle, was tinted glass. In back, vertical tail lighting ran down the C-pillar before turning rearward across the top of the trunk. Inside, everything below the beltline of the windows — essentially all but the headrests and top portion of the steering wheel, was hidden from view. Behind the Celestiq, a large digital display showed a rendering of its interior. The dash consists of a pillar-to-pillar curved LED display serving as both instrument panel and infotainment system. Protruding forward between the front seats was another touchscreen that appeared to house some more controls, with open area, probably for storage, below it. The rear seats had the same sort of touchscreen between them. Built into the back of the front seats were a pair of rear-seat entertainment screens, much like we saw in the Lyriq. The door panels blended wood, metal and animated lighting to give character and a sense of opulence. GM interior design manager Tristan Murphy was on hand to tell us a bit more about the Celestiq.