Honda Motor Co. will invest $340 million to build fuel-efficient gasoline engines in Ohio as it plans a slate of new electric cars in a push for more vehicles with lower emissions.

Honda has added an assembly line at its Anna, Ohio, plant to build the new turbo-charged, four-cylinder gasoline engines, set to debut later this year. The so-called VTEC engines boost efficiency with valves that vary the flow of air and fuel depending on speed.

The Tokyo-based automaker also plans to debut its next fuel cell vehicle next year and will offer both a plug-in hybrid and a battery-only electric car by 2018.