1965 Ferrari 275 GTB. Montana’s plate (USA)
The 275 GTB was a two-seat grand touring coupé produced between 1964 and 1966. The name of this model was derived from the engine’s per-cylinder displacement of 275 cc and the Italian designation Gran Turismo Berlinetta.
The 275 GTB used a double overhead cam 3.3 litre Colombo-designed 60º V-12 engine designated Tipo 213. This engine was the final development of the Colombo V12, with a stroke of 58.8 mm and a bore of 77 mm. The internal parts of the engine were derived from those used in other Ferrari models including the 250 GTE 2+2, 250 Lusso and 250 GTO. Three twin-choke Weber 40 DCZ 6 or 40 DFI 1 carburetors were equipped as standard. Power was claimed to be 280 horsepower (210 kW) at 7600 rpm, but provided closer to 240-250 hp (190 kW) in actual use.
A factory option of six twin-choke Weber 40 DCN carburetors was also available, which Ferrari claimed provided 320 hp (240 kW) at 7500 rpm although the actual increase in power over the three-Weber setup was likely only 20-25 hp. The rear wheels were driven by a 5-speed manual transaxle with Porsche-style syncromesh and a limited-slip differential. This was the first time a transaxle was used on a Ferrari production road car, although they were used on some earlier Ferrari competition models such as the 250 Testa Rossa.