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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.

2014 Chevy Silverado priced from *$24,585, V8 gets better economy than Ford EcoBoost V6

Chevrolet has thrown down the next hand in the pickup truck poker wars and revealed at least a couple of potential aces - depending on which numbers matter most to you. The 2014 2014 Silverado 1500 with its 5.3-liter EcoTec3 V8 gets 335 horsepower and 383 pound-feet of torque, is mated to a six-speed automatic, can tow 11,500 pounds with the optional Max Trailer Package and costs the same as the outgoing Silverado, $24,585 (*including $995 destination fee). Chevy says the Silverado also stands atop the fuel economy charts when comparing any competitor with a V8 engine - and some competitors with V6 engines. The two-wheel drive model returns 16 miles per gallon city, 23 mpg highway, 19 mpg combined in two-wheel drive guise and 16 mpg city, 22 mpg highway and 18 mpg combined as a four-wheel drive.
For context around those numbers, the most fuel efficient V8-powered 2013 Ford F-150 pickups lose about two mpg in every metric compared to the Silverado, the 3.5-liter V6 EcoBoost returning 16 city, 18 highway and 22 combined in two-wheel drive. However, that EcoBoost does have 365 hp and 420 lb-ft of torque. You can get a Ram 1500 with a 3.6-liter V6 that gets 25 mpg highway, but it has 305 hp and 269 lb-ft of torque. The 2013 Ram with the 5.7-liter Hemi V8 and its 395 hp and 407 lb-ft drops one mpg in every category to the Silverado. Its tow rating is 200 pounds beyond its nearest competitor, the F-150 with the Max Trailer Tow Package.
Elsewhere, the new Silverado gets a quieter cab with a redesigned interior, a new bed with improved load-management possibilities, disc brakes all around, tweaked steering and suspension, along with free standard scheduled maintenance for two years or 24,000 miles.

GM offering factory-backed extended warranty for Chevys, GMCs, Buicks and Cadillacs

Cars are generally more reliable than ever before. When things do go wrong, every automaker offers some form of factory warranty (in most cases at least three years and 36,000 miles, though many extend even longer), providing peace of mind to new-car buyers that many faults will be fixed at no charge to the customer. Starting today, GM is offering a new optional plan that will extend the factory warranty on all new Chevy, GMC, Buick and Cadillac products. In the past, extended warranties have been offered as dealer add-ons, with all profits from these sales going to the dealership. GM's new program can be viewed as another nail in the the looming dealership-model coffin. According to Automotive News, some dealers aren't happy to see GM cut into their business like this, saying that it helps GM far more than it does dealers. GM says the new program will help keep customers in the GM family. Customers are also more likely to visit a GM service center rather than going to an independent repair shop. Currently, new Chevy and GMC vehicles come with three-year/36,000-mile warranties. Buicks and Cadillacs are covered for 4 years or 50,000 miles. The new program extends Chevy and GMC warranties to five years or 60,000 miles. Buick and Cadillac warranties extend to six years or 70,000 miles. GM, citing IHS Markit, says most owners keep new cars for about 6.8 years, so these warranties will cover most of the length of their ownership. The extended warranty will add between $1,000 and $2,000 to the price of a vehicle, and the additional cost can be rolled into the vehicle's purchase or lease price. Unlike many dealer extensions, the factory program covers the vehicle no matter who owns it. That should help increase the car's resale value if it's sold within the covered timeframe. GM says there's no deductible and no need to file a claim form when getting warranty repairs. Additionally, dealerships can continue to sell their own extended warranties or service contracts. Related Video: