The base model Porsche 928 featured a large, front-mounted and water-cooled V8 engine driving the rear wheels. Originally displacing 4.5 L and featuring a single overhead camshaft design, it was rated at 219 hp (163 kW; 222 PS) for the North American market and 240 PS (177 kW; 237 hp) in other markets. Porsche upgraded the engine from mechanical to electronic fuel injection in 1980 for US models, although power remained the same. During its production years, it was available in automatic or 5-speed manual.  The base model 928 would evolve into the Porsche 928 S for model year 1980 in Europe and 1983 in North America.