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The last and most desirable 275 was the GTB/4 with its signature four cam, dry sump, V12 engine. It benefited from a variety of upgrades introduced into the series that were tried and tested in the 275 Competition models. This meant the GTB/4 had long nose bodywork, a torque tube driveline and an engine capable of 300 bhp as well as all the traits of the original 275.

GTB/4's are easily identified by a hood blister that accommodates the larger air filter housing. Most cars were bodied in steel, but a few received aluminum bodies and are very easy the best road-going 275s.

The move to the quad cam engine was motivated by Ferruccio Lamborghini who spent a fortune making engines that were more radical than Ferrari’s. So, the quad cam kept Ferrari on pace, but it could be argued that sales brochure figures were the primary beneficiary of the GTB/4’s introduction since any actual performance increase was slight.

The GTB/4 was the last incarnation of the 275 and was replaced by the 365 GTB Daytona. In total, almost a thousand examples were made and only a handful of these were made with aluminum bodies and even less were delivered as NART Spyders.