General Motors plans to invest $76 million in its two US manufacturing plants to boost the production capacities of its Chevrolet Silverado and GMC Sierra pickup trucks. GM (GM) intends to inject $70 million in its Tonawanda, New York engine factory and over $6 million in its Parma, Ohio metal stamping facility. According to the company, “The Tonawanda investment will be used to increase capacity on the engine block machining line and the Parma investment will be used to construct four new metal assembly cells to support increased truck production volumes.