I don't know if those cars were actually built in the U.S.-good question:confused:
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The first car entered in the Indy 500 with more than 1000 claimed horsepower (some sources say as high as 1350) was the GE turbine engined Epperly driven by Bill Cheesbourg in 1966. It had deceleration problems and failed to qualify.
The last car(s) with more than 1000 horsepower (1024 reported) entered in the Indy 500 were the 1994 Illmor-Mercedes-Benz Penskes driven by winner Al Unser Jr., Emerson Fittipaldi and Paul Tracy.
This link states that the Panoz G Force was designed in UK and built in Georgia USA.
Don't know how reliable it is.
https://www.auto123.com/en/racing-ne...ver?artid=6094
How about Al Jr.'s 1992 winning Galmer?
I think the first foreign chassis to "take over" Championship (Indy) cars was March.
Lola maybe?
The first passive ground effect car-the 1977 Lotus 78 F1 car.
The first "full" passive ground effect Championship (Indy) car-the 1979 Chaparral 2K
First non F1 car to win a WC event-Piero Taruffi driving a Ferrari 500 F2 car in the 1952 Swiss Grand Prix
First WC event won by a non F1 legal car-Bill Vukovich driving a Kurtis Kraft/Offenhauser in the 1954 Indianapolis 500
I'm almost certain it would since it was a 4.5 liter normally aspirated car which was the limit in Formula 1 in 1950-53 (If that doesn't make it a F1 legal car, I'd be interested to know why and would stand corrected). The regular WC GPs in 52 and 53 were run under F2 rules but the legal F1 cars those years (while relegated to non-Championship events and Indy) were still 4.5 liter vehicles.