Question: The Toyota GZ engine is used as the powerplant for what  large four-door limousine produced mainly for the Japanese market?
Sentence (from "Toyota Century"): The Toyota Century (Japanese: トヨタ・センチュリー) is a large four-door limousine produced mainly for the Japanese market, serving as Toyota's flagship car within Japan; whilst globally the unrelated Lexus LS series is Toyota's flagship luxury model outside Japan.
Relevant evidence: Yes