If you are looking for big differences between the design of the alloy GTB/4 and the normal GTB/4, then good luck. You may not spot the differences in our fifty plus photos and image below because they are so subtle. To fashion the roof in aluminum, it had to be shaped in multiple pieces which meant a crease was placed at the top of both the A-pillar and C-pillar. Of course the major advantage to the GTB/4 is its reduced weight and resistance to rust. Learn more about the Ferrari 275 GTB/4 Alloy Berlinetta here.