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How restrictor plates work

Find out how those restrictor plates everybody is talking about really work and what consequences have resulted from their use in almost 20 years.

Updated: June 20, 2007, 7:40 PM ET
ESPN.com

Pros and cons of restrictor plates will be debated thoroughly this weekend as the Nextel Cup series stops again at Talladega Superspeedway for the Aaron's 499.

In fact, a smooth track fresh from a fall repaving helped increase speeds so much that NASCAR made the four holes on restrictor plates 1/32 of an inch smaller for Friday's Busch series qualifying.

So what do these metal plates with four holes drilled into them do exactly once they are installed atop the carburetor?

The ...

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