 Instead, in 1971, Ferrari focused on a new 3.0L prototype based on the 180° flat-12 "boxer" from the 312B F1 car.Officially this design was known as 312P, the motorsports press appending the B to avoid confusion with the earlier 312P V12 cars.This design was similar to the traditional Porsche engine layout with its low center of gravity, but Ferrari used water-cooling and 4-valve heads.