General Motors Co. will invest more than $200-million (U.S.) at its engine plant in St. Catharines, Ont., to make the next generation of V8 engines and install a flexible assembly line, sources said.

An announcement will be made at the factory Tuesday, sources familiar with the company's plans said. The investment in St. Catharines and another $400-million earmarked for a plant in Tonawanda, N.Y., near Buffalo form the bulk of about $850-million the auto maker is spending to upgrade five of its engine and engine components plants in North America.

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