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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...

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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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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Last Indianapolis 500 with fewer than 33 starters:

1947 with 30

First major race won by a rear (mid) engined racing car:

The 1934 German Grand Prix won by Hans Stuck in an Auto Union Type-A

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The last time more than 34 cars qualified in an Indy Car race:

1997 Indianapolis 500 with 35

First Grand Prix WC race with fewer than 15 starters:

1950 Belgian Grand Prix with 14

Last Grand Prix WC race with fewer than 15 starters:

2005 U.S. Grand Prix with 6

First and last World Drivers Championship race with more than 33 starters:

1953 German Grand Prix with 34

First and last times AAA/USAC Championship/Silver Crown/Indy Cars competed at the Darlington Speedway--

First: 1950 when Johnnie Parsons won the 200 miles event driving a Russo-Nichels/Offenhauser...

Of note relating to the Rolex 24 Hour Race at Daytona for which practice begins tomorrow and is the first major race of the year at least in the Northern Hemisphere--The first 24 hour automobile...

Last fatality in an Indy/Champ Car race: Justin Wilson Pocono 500 2015. R.I.P. Justin

https://www.youtube.com/watch?v=d6S3X3g_MyI

The last time more than 33 cars started in an Indy/Champ Car event:

Las Vegas 2011. R.I.P. Dan

https://www.youtube.com/watch?v=YsataYtOJfs

According to Wiki-20 degrees

The last time Championship (AAA/USAC/Indy) Cars raced on a track with turns banked at least 30 degrees was the 100 mile event run at the Daytona International Speedway on April 4 of 1959. Jim Rathman...

The first time Championship (AAA/USAC/Indy) Cars (excluding preliminary trials the same day) raced on a track with turns banked at least 30 degrees was the 100 mile event run at the Los Angeles...

The last time a Formula 1 race was won by a front engine car (excluding vintage car events) was the non-Championship International Gold Cup at Oulton Park in 1961. Stirling Moss in the AWD Ferguson...

The last time Formula 1 cars raced on banking greater than 10 degrees in a WC evnt:

1961 Italian Grand Prix won by Phil Hill in a Ferrari.

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Perhaps the first major multi-lap motor race held on a closed course running only in a clockwise direction:

The 10 lap Vanderbilt Cup Race run on Long Island in 1904.

1st-George Heath in a...

First major (or perhaps any) motor race held on a figure-8 course:

The Gordon Bennett Cup Race held at Athy, Ireland in 1903.

1st-Camille Jenatzy in a Mercedes at 6:39:00
2nd-Rene de Knyff in...

First major multi-lap motor race held on a closed course and thus the first proto-Grand Prix:

The 6 lap (run anti-clockwise) (318 mile) Circuit des Ardennes race run at Bastogne, Belgium in 1902....

The first and, so far, last Formula One engine to operate at a speed greater than 25,000 rpm (gear reduced before output shaft):

The Pratt & Whitney STN 6/76 turbine in the 1971 Lotus 56B

I believe Ferrari had a transverse mounted air cooled staight-8 F1 car on the drawing boards in the 1960s but it was never raced or, to my knowledge, even built. If true, I suppose that was the last...

The first V-8 Formula 1 cars to compete in a WC F1 GP event:

A pair of Lancia D50s that DNFed in the 1954 Spanish Grand Prix driven by Alberto Ascari and Luigi Villoresi

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The first V-8 to compete in a WC GP event:

An AFM-Kuchen that DNFed in the 1952 Swiss Grand Prix driven by Hans Stuck

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The first V-8s to compete in a WC event:

Two Kurtis Kraft Novis that DNFed in the 1951 Indianapolis 500 driven by Duke Nalon and Chet Miller

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