1971 Opel GT with a 2.0 L Zetec Inline-Four When this 1971 Opel GT rolled out of the factory it was powered by a 1078 cc (65.8 ci) or 1897 cc (115.8 ci) inline-four. Whatever the engine, it’s now powered by a 2.0 L Zetec inline-four from a 200...