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NASCAR has adjusted its aero rules after just one Cup Series practice session at Talladega Superspeedway amid concerns over high speeds. This weekend is the first superspeedway race under NASCAR's new aero rules for the 2019 season, which include replacing the restrictor plate long used to control speeds on the fastest tracks with a tapered spacer. To address concerns in the Cup paddock about the toll on engines and high speeds during Friday's first practice session, NASCAR has issued two rule changes for the remainder of the weekend.
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