The much improved Islero S still had some big competitors against it, the mass built
Chevrolet Corvette was again the biggest rival on
the US market, but in Europe the Ferrari 365 GTS
was a bigger problem. The Jaguar E-Type III and
the Maserati Mistral 4000 were also considered as
competitors to the Islero S, although not as important as the Ferrari.
A few limited built cars could also be seen as rivals, like the
AC 428 Coupe and the Aston Martin DBS,
which did get built in some bigger numbers than the Iso Grifo GL
and the Monteverdi HighSpeed 375 S.
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