The GTO '64, also known as the Series II, was the redesigned 250 GTO bodywork developed by Mauro Forghieri and Mike Parkes. It adopted many aerodynamic features from the 250 LM without adopting its mid-engine, rear-wheel-drive layout, and was intended to keep the GTO competitive for another year after the FIA refused to homologate the 250 LM for the GT class in 1964. Three cars were built brand-new, and four earlier GTOs were converted by the factory. Performance gains were marginal, but in 1964, Phil Hill and Pedro Rodriguez took overall victory at Daytona for NART.
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Learn more1964 redesign · The homologation myth
1964 redesign
In 1964, Ferrari commissioned Mauro Forghieri and Mike Parkes to redesign the body of the 250 GTO. Many aerodynamic features from the 250 LM were incorporated, which is why both cars resemble each other, although the GTO does not have a mid-engine. The factory also made minor changes to the engine, gearbox, chassis, suspension, and interior. The power gain remained small, but factory and privateer teams continued to enjoy racing success. Of the 36 GTOs, 33 belong to Series I and three to Series II.
The homologation myth
In 1962, the FIA required at least 100 units built for Group 3; Ferrari built only 36 GTOs. A trick was not necessary, however: production covered the homologation of the earlier 250 GT Berlinetta SWB. Its 1960 papers were extended several times between 1961 and 1964, allowing modifications to the engine, transmission, and chassis. Because more than 100 bodies had been built to SWB specification, a new body was permitted.
Summarized from the cited sources; every figure was automatically verified against the sources.
1962