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Restrictor plates debuted in August 1970 at Michigan International Speedway and were used for all tracks. They were phased out in 1974 as teams went to smaller engines but returned in 1988 for Daytona and Talladega after speeds overtook ability to keep the cars on the ground.

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The Nascar Cup Series started to use restrictor plates on a yearly basis beginning in 1988. They are only used at Daytona International Speedway and Talladega Superspeedway.

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Q: When did Nascar start using restrictor plates?
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