General Motors announced today that the 5.3-liter V8 found in both the GMC Sierra and Chevy Silverado has been SAE rated at 355 hp and 383 lb-ft of torque, and will get an estimated 23 mpg highway for rear-wheel drive models, and 22 mpg highway with four-wheel drive.

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GM plans to release its revamped lineup of trucks next year as 2014 models, and it appears that the American automaker won’t be equipping them with eight-speed automatic transmissions – at least not yet.

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