Giotto Bizzarrini had worked with Alfa Romeo before leaving to join Ferrari, however after turning the Ferrari 250 GT into the famed kamm-tail 250 GTO he was persuaded away to the fledgling Lamborghini company where he worked on the V12 engine. Then Bizzarrini was commissioned by the Iso Rivolta organisation to develop a new chassis for the Iso Rivolta GT sold from 1963 to 1970. At the 1963 Turin Salon a shortened GT chassis was developed by Bizzarrini for the Iso Grifo A3/L with 327 cu inch Chevrolette Corvette engine and bodywork designed by Giorgetto Giugiaro. But the same Turin show also exhibited the Iso Grifo A3/C on a separate stand which was mechanically similar to the Grifo with a different lightweight body als designed by Giorgetto Giugiaro. The A3/C was entered for the 1964 Le Mans 24 hour race where it finished 14th after a breakdown, but took the class win in the 1965 event. The A3/C and A3/L had different bodies, and in the A3/C the engine sat so far back in the chassis that it was in the cabin. Bizzarrini fell out with Iso over his competition interests and the two parted company, with Iso continuing to see the Grifo whilst Bizzarrini took the A3/C and put his own badge on it; actually he had cheekily been puttin 'Bizzarrini ' badges on the A3/C almost since the start. Bizzarrini built the chassis for both cars, the Chevrolet Corvette provided the engine, and bodies for the Grifo were built by Carrozzeria Bertone and for the A3/C by Drogo. After the split from Iso, Bizzarrini branded his car as the 5300 GT and offered it as the 'Corsa' (Racing) and 'Strada' (street) versions. Later there was a 5300 'America' with fibreglass bodywork. Around 100 Bizzarrini cars were produced until 1969 when the production ended as the operation was not financially viable.