The first AWD single rear engined racing car to start in a major event:
The Gulf Miller 6 cylinder driven by George Bailey in the 1939 Indianapolis 500
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The first AWD single rear engined racing car to start in a major event:
The Gulf Miller 6 cylinder driven by George Bailey in the 1939 Indianapolis 500
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It looks like the first AWD racing car entered in a WC/F1 event was a Gulf-Miller entered in the 1950 Indianapolis 500. The car was run in practice by driver Al Miller but did not qualify.
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First Layover engine roadster to race in the Indianapolis 500: The Cummins Diesel Special driven by Fred Agabashian in 1952
Last layover engine roadster to race in the Indianapolis 500: The Arizona Apache Airlines Special drive by Bill Cheesbourg in 1964
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I think that, Jimmy Jackson's car in 1950 had a roots supercharger and Freddie Agabashian's mount in 1952 was turbocharged-the first tubocharged racing car!