New for 1966, the Ferrari 275 GTB4 featured a new addition to the 275 recipe. You see, while the original 1964 275 GTB housed the 3.3-litre, dual overhead camshaft Colombo V12, the GTB4 used a slightly new design. And the revised model name gives you a clue as to what was changed. Meanwhile, the rest of the innovative features from the 275 GTB were largely the same, which was a good thing. After all, the original 275s remain a highly-sought after example of classic Ferrari design.
About that Engine
The main improvement that transformed the GTB into the GTB4 is the addition of two overhead camshafts. So, in place of the two that were standard on the previous model, the Ferrari 275 GTB4 sported 4 total overhead camshafts. To make this design work, two camshafts were fitted to each bank of the V12.
This unusual engine arrangement resulted in a 20bhp boost to the GTB’s base 2-cam engine. Six Weber carburettors helped the 300bhp powerplant produce more torque through the mid-range as well. And while most of the original design was untouched, Ferrari implemented minor improvements to the exhaust and suspension. Top speed was listed as 268 km/h
The Rest Stays the Same
Matched up to that new engine design was the same ground-breaking transaxle assembly from the GTB. Another carryover was the independent rear suspension, which replaced the common live rear axles used on most other Ferraris made prior to the 275 series. While these were new technologies to the Italian brand’s production cars, they had been tested vigorously on the track in the grand Ferrari tradition of developing technology on the track before installing it on production models.
As for the bodywork, the GTB4 used the long-nose style from the previous model. The only difference was the addition of a narrow bulge running down the centre of the bonnet. From its debut in 1966 up until production ceased 2 years later, 330 examples of the Ferrari 275 GTB4 were built. Unlike the original GTB, no competition versions were made.