The Mark II found much success throughout its life as the definitive private-use executive car in Japan (the larger Toyota Crown was considered more of a chauffeur-driven car for upper management, and the Toyota Century is the flagship sedan on a presidential level). The Mark II and its variants often sold in numbers comparable to the smaller Toyota Corona and Toyota Corolla. Popularity peaked in the 1980s and the Mark II was available with engines ranging from a 1.8 liter 4-cylinder to a turbocharged 2.5-liter than pushed the 280 horsepower (209 kW) self-imposed limit of the Japanese auto industry. Like the first-generation Corolla in 1966, the Mark II would come to symbolize Toyota's winning formula of capturing its customer's upward aspirations through excellent perceived quality.
The Corona Mark II, was designed as a model line that was between the top model Crown and the Corona. Basically it's a slightly higher spec than a Corona, with many of the same features of the larger Crown. The four door sedan was designated as the T60 and the 2 door coupé the T70. In 1970 there were minor cosmetic changes in the front grille. The 1600cc 7R series engine was replaced by the 1700cc 6R series engine. A year later the 1500cc 2R models were replace by the 1600cc 12R engines.
US exported version for the same model year, often include the more powerful R series motors compared to other regions. While Japan and other markets often had 1.5L 2R (1500cc), 1.6L 7R/12R (1600cc) to 1.7L 6R (1700cc) models as well.
RT62 sedans and RT72 coupé features the 1.8L 8R (1900cc).
RT63 sedan, RT73 coupé, RT78/RT79 station wagons feature 2L 18R (2000cc)
The second generation Corona Mark II was based on a new X series platform abandoning the compact Corona T series chassis. X20's are referring to the 2-door sedans, while the X10's are the sedans and wagons. The i6 M was added to form the L series, in order to compete better with the Nissan Skyline. The dramatically different styling used on this series is similar to the Renault 16.