Subaru introduces its horizontally opposed, aka "boxer," powerplant on May 14, 1966, in the all-new 1000 sedan. With a meager 54 hp, the engine had just enough power to move the car along, and that model became one of the most important volume cars for the fledgling automaker.
The 1000's water-cooled engine featured overhead valves driven by push rods, and sent power to the front wheels. The car was available as a two-door and four-door sedan, in addition to a station wagon.
Fifty-one years and more than 16 million engines later, every Subaru is now equipped with a boxer engine, though the design traded push rods for overhead-cam-driven valves decades ago.
The 1000 lacked one other feature that Subarus have become known for: symmetrical all-wheel drive, which came in 1972.