1967 was a banner year for the enzo ferrari motor company, as it saw the production of the mid-engined 330 p4, a v12-engined endurance car intended to replace the previous year's 330 p3. only four ferrari p4-engined cars were ever made: three new 330 p4s and one ex p3 chassis (0846). their three-valve cylinder head was modeled after those of italian grand prix-winning formula one cars. to this was added the same fuel injection system from the p3 for an output of up to 450 hp (335 kw).