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Indy cars with not Indy 500.

It was brought to my that NASC has Indy 400 a race added many years after the Indy 500 to give Nascar the same prsstige and the Indy 500 and Indy cars had to the world..

Yet to Not have the Indy 500 on Indy series just makes zero sense to me.. But I guess I will be only one.. But both formula 1 and Indy type cars benefited from the car engine and tire design testing discovers from running the Indy 500.