DETROIT – General Motors said that the additional demand for Ecotec four-cylinder engines in a range of its vehicles is behind the company’s $65 million investment in plants in New York and Tennessee.

GM is adding additional production capacity at its Tonawanda, N.Y., plant for engines for the Chevrolet Equinox and GMC Terrain crossovers. GM said it is investing $33M in this plant.

The automaker said it is adding production capacity at its Spring Hill, Tenn. plant for direct-injection four-cylinder engines for the 2013 Chevrolet Malibu. The company is investing $32M.

The automaker said the investments in the Tonawanda and Spring Hill plants are part of $2 billion in U.S. manufacturing investment GM announced May 10 that will create or retain 4,000 jobs in 17 facilities in eight states.