The Prince Royal was the third Japanese built post-war vehicle to use a V8 engine; the first was the Toyota Crown Eight in 1964, and the second was the Nissan President in 1965.

Because of the massive weight at 3,200 kg (7,054 lb), a 6,437 cc (391 ci) Prince series W64 V8 with overhead valves, producing 260 PS (191.2 kW; 256.4 bhp) was used along with custom 8.90-15 Bridgestone tyres.

A three-speed GM Super Turbine 400 (THM400) automatic transmission is used, with the gear selector installed on the steering column.

An additional roundel, known as the Imperial Seal of Japan is also displayed at both the front and rear of the car in place of a license plate, and on the exterior of both rear passenger doors, displaying a 16 petal chrysanthemum, in golden colour, in reference to the Chrysanthemum Throne of Japan.

The windows have curtains and double pane glass, allowing the passenger compartment to be pressurized for additional security protection.