The Ferrari 275 GTS/4 NART Spider (a/k/a GTB/4S NART Spider) was a two-seater convertible version of the 275 GTB/4, 10 of which were built in 1967, as a special order by Ferrari's North American dealer, Luigi Chinetti. These cars were informally named NART Spiders, referring to Chinetti's North American Racing Team although the "NART" moniker was never part of the model's official designation from the factory. The 275 GTS/4 was powered by the same engine in the 275 GTB/4, the Tipo 226 3285.72 cc Colombo V12, with four overhead camshafts and six Weber 40 DCN carburetors as standard.