Depends on the track and/or sanction the race is in, most sanctions have limits. without knowing your favorite race type I cant tell you.
If race cars didn't race they wouldn't be race cars.
Their are several cars that don't qualify for a race because they where to slow. Only 43 race cars can be allowed to race so its not over crowded on the race track.
There are many places where a person can find images of race cars. One good place to find images of race cars are in books about racing. A local library or bookstore would have books with pictures of race cars in them. Also, many sites online have pictures of cars and race cars.
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You will have to be more specific. Race car is too broad a term. There are many different types of race cars using many different engines.
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Homestead
in Nascar it is 43 world of outlaws sprint cars is 24 and any other unknown race track has as many cars that enter the race in each class
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43 cars race in each Nascar Sprint Cup race. The numbers change on how many enter.
There are many types of "race cars". Be more specific.