The 275 GTB/4 needed extra space to clear six downdraft Webers. The big change between the two models was fitting the V12 with four overhead camshafts, two per cylinder bank in what is known as a Tipo 226. This engine was based on the 3.3 and 4.0-liter engines that powered the 275 and 330 P2 prototypes during the 1965 race season.
This gave the 275 GTB/4 notable mid-range torque and a top speed of 160 mph putting competition levels of power in the hands of Ferrari customers looking to drive these cars home rather than on the track. Its weight distribution and handling made it a road car unlike any other.
According to Supercars, there were also a very small number of GTB/4 units that were built with aluminum bodies. The difference can be seen in the roof, which was made in several pieces leaving a crease at the top of the A and C pillars. These lightweight versions of the GTB/4 can fetch over $1 million when they come up for auction.