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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.

GMC Hummer EV will be unveiled during the World Series and 'The Voice'

A big-time vehicle reveal deserves a prime-time multi-platform debut. At least, that seems to be the opinion of the folks tasked with reintroducing the American public on October 20 to the Hummer nameplate, this time affixed to pickups and SUVs that also wear General Motors' "Professional Grade" GMC badge. And instead of a standalone brand with dealerships full of gas-guzzling off-road beasts, this new, kinder, gentler and fully electric Hummer won't sip any gas at all. The debut will take place across several channels. As has been the de facto process during the pandemic, the event will be streamed online. But — taking a page from the reveal of the Ford Bronco this past July — it will also be witnessed by watchers of the World Series on Fox and "The Voice" on NBC (at least those who are watching live and aren't skipping commercials). Interestingly, according to The Detroit News the television segments will be spread across multiple commercial breaks as sort of a mini film. Naturally, we'll be covering the unveiling live right here on Autoblog, and we'd argue that's the best place to see it all unfold (we admit we may be biased). In any case, no matter where you watch you'll be treated to a host of details about what GMC is calling "the worldÂ’s first super truck." We know it'll boast 1,000 horsepower, go from 0-60 in around 3 seconds, have the next generation of GM's Super Cruise autonomy technology, have removable roof panels and be able to crab walk. Sounds pretty super to us, and we're looking forward to the full reveal in just a couple of weeks. See you then. Related Video:

GM program sees dealers taking on way more loaner cars

Given the volume of vehicles we're talking about, this is a significant development for GM's bottom line. Bring your car into the dealership for service, and you may need a loaner car in exchange. And with so many recalls being carried out, that means a lot of loaners – especially at General Motors dealerships. That could be one of the reasons why GM is massively expanding its loaner fleet program. While many Chevrolet and Buick-GMC dealerships have an on-site rental car location operated by a third party like Enterprise (which may or may not provide a GM vehicle), others manage their own loaner fleets. But while the range of dealerships operating such fleets was once small, reports Automotive News, the number has been growing rapidly: from the locations responsible for only 20 percent of those brands' sales two years ago to about 90 percent today. The impetus for that growth comes down to a massive expansion of GM's Courtesy Transportation Program. The initiative encourages dealers to ramp up their loaner fleet to a maximum size determined by GM, with a mix determined by the dealer itself, so that a showroom in Texas can be bolstered with a fleet of pickup trucks and a dealer in California can employ more Volt and Camaro Convertible loaners. The dealership gets a $500 credit for each vehicle its puts in its fleet, and can use those vehicles as loaners for service customers, as multi-day test drivers or to rent out separately. The vehicles remain in the dealer's fleet for 90 days or 7,500 miles, then they can be sold as used, but with new-car incentives. The dealer gets a fleet of loaners, customers get to use the loaners, try out a new car overnight or buy a barely used car with attractive incentives, and GM gets to clock more sales. But therein lies the kicker: the automaker counts the dispatch of the loaner new vehicle to the dealership as a new-car sale, which could end up distorting its sales figures. Counting loaner vehicles as sold vehicles is something of an industry-standard practice, but given the volume of vehicles we're talking about, this is a significant development for GM's bottom line. One dealership - Paddock Chevrolet in Kenmore, NY, for example - had no loaner fleet two years ago, but now runs a fleet of 50 vehicles. Multiply that by the 4,000 or so dealers GM has across America and you're talking about the potential for hundreds of thousands of these sorts of sales.