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Leak reveals GM's 2017 heavy duty diesel trucks to get 910 lb-ft of torque [UPDATE]

UPDATE: Chevrolet officially announced specs for the 2017 Silverado HD and the rumors were true. The truck's new Duramax 6.6-liter turbo-diesel V8 puts out 445 horsepower and 910 pound-feet of torque. Chevrolet says the new motor produces 19 percent more torque and 12 percent more horsepower, while producing 35 percent fewer emissions. Overall, the new engine is a big improvement over the current motor, which generates 397 horsepower and 765 pound-feet of torque. According to Truck Trend, GM's newest heavy duty pickup trucks will pick up quite a bit more power and torque. The publication spotted a recent GM Powertrain ordering catalog that had the engine specs for the 2017 model year and managed to get some screenshots before the catalog was taken down, and they can be viewed here. The screenshots revealed that the 6.6-liter turbodiesel V8 powering the Silverado and Sierra heavy duty models will boast 445 horsepower and 910 lb-ft of torque. This is a substantial gain over the current models' 397 horsepower and 765 lb-ft of torque, and as Truck Trend points out, it exceeds the Ford Super Duty line's horsepower output of 440, but comes short of the 925 lb-ft rating. Truck Trend credits part of this output gain to the new intake system GM will introduce on the 2017 heavy duties. The intake gets 60 percent of its air from a scoop on the hood, with the other 40 percent coming from behind one of the front fenders. GM doesn't reveal horsepower figures in the press release about the scoop, but it does say the cooler air helps with maintaining the engine's output, and that the scoop does produce a ram-air affect, providing more air at speed. As we know, more air plus more fuel equals more power, but there's likely more to the power increase in this engine than only the intake. Related Video: News Source: Truck Trend via MSN Chevrolet GM GMC Truck Diesel Vehicles

MotorWeek turns back the clock with the 1994 Mustang and Camaro

The Ford Mustang and Chevrolet Camaro have battled it out for pony car supremacy for as long as most of us can remember, and the latest examples of both coupes continue to offer buyers impressive performance for their price. MotorWeek's Retro Review series remembers a classic battle in that fight in a video that pits the 1994 Mustang GT against the Camaro Z28 at Charlotte Motor Speedway. MotorWeek smokes the tires on both of these coupes at the speedway and shows off how they handle on track. Both vehicles come away with their own advantages in the challenge. The red Mustang packs Ford's 5.0-liter V8 with 215 horsepower and a five-speed manual gearbox. The MotorWeek crew praises the vehicle's stability at high speed and the ease of driving it around the track. The Camaro wins on power with a 275-hp 5.7-liter V8, and the show lauds the Chevy's six-speed manual. Check out the video to relive one entertaining skirmish in the ongoing pony car war. Related Video:

Franchitti, Kanaan, and Dixon prank young IndyCar driver

The 20-year-old Sage Karam is a rising star in racing after scoring the 2013 Indy Lights Championship and taking ninth place in the 2014 Indianapolis 500. He's now competing for Chip Ganasi Racing, one of the top teams in the IndyCar Series, and counts this year's pole sitter Scott Dixon and former winner Tony Kanaan as teammates. Of course, being so young and a new member of the squad, some lighthearted hazing is to be expected. Dixon, Kanaan, and three-time Indy 500 winner Dario Franchitti decided to play a little prank on Karam. While ostensibly detailing his Chevrolet Camaro, the three joking racecar drivers turned it into the Karamo. Check out the video above to see exactly what that means. After some scary crashes going into this year's event, it's refreshing to watch some cheery things happening at Indy.