Which Ferrari model introduced in 1973 featured a flat-12 engine?

The Ferrari Berlinetta Boxer, specifically the 365 GT4 BB introduced in 1973, was the Ferrari model that brought a flat-12 engine to the company’s road-car range. It replaced the front-engined 365 GTB/4 Daytona with a radically different rear-mid-engine layout.

The 365 GT4 BB used Ferrari’s Tipo F102A, a 4.4-liter engine with two banks of six cylinders set at 180 degrees. Ferrari developed the road-going unit from its experience with flat-12 racing engines, including the Formula One 312B. The low engine layout helped reduce the car’s center of gravity.

The name “Berlinetta Boxer” is widely used, but the engine is technically a flat-12 or 180-degree V12 rather than a true boxer engine. Its opposing pistons share crankpins and move in the same direction. The 365 GT4 BB was followed by the 512 BB and 512 BBi, before the series evolved into the Testarossa.