General Motors accidentally stole its own thunder by publishing the power figures of its new 6.6-liter V-8 Duramax turbo-diesel engine on one of its websites. Dubbed L5P, the engine is set to find its way under the hoods of the company’s heavy-duty trucks: the 2017 Chevrolet Silverado HD and the 2017 GMC Sierra HD.
GM, for its part, appears...
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