Ferrari boycotted sports car racing in 1968 to protest a rule change that banned Ferrari’s 4-liter 330 P4 (engines could not exceed a cylinder capacity of three liters). Ferrari went ahead and downsized their approach, building a 3 liter prototype in 1969, calling it the 312 P. It was basically a 3-liter F1 engined Ferrari312 with open Barchetta body. Ferrari soon thereafter closed the top. The 3.0 liter V12 engine produced 450 bhp at 10,800 rpm.
The Ferrari 312 P was raced in 1969 and 1970. The new 1971 version of the sports prototype came with a flat-12 engine, often referred to as a boxer engine. The first version of the sport prototype model with this denomination, not to be confused with the one from 1971, Ferrari called in the same way although it had a completely different engine.
The cars were driven by the official drivers of the year 1969 and later handed over to Chinetti.