The 2019 NASCAR aerodynamic rules package will be slightly tweaked for superspeedway races, prior to the first Talladega Superspeedway race of the season April 28.
The tweaks are the result of NASCAR officials seeing faster than desired speeds during a test at Daytona International Speedway following February's season-opening Daytona 500.
Changes include a one-inch increase in spoiler height to nine inches and a one-inch bolt added to the track-bar mount to change height to 12 inches.
The aim of the 2019 aero package is to slow speeds and bunch up cars at tracks 1.5 miles and larger.
The package includes a larger rear spoiler and front splitter, a tapered spacer that reduces engine output to approximately 550 hp and aero ducts. Variations of the package are being run throughout the season since making its debut at the Atlanta Motor Speedway in February, after the Daytona 500.
The aero package has yet to be used in competition on a superspeedway, as the Daytona 500 utilized the 2018 aero package, including restrictor plates. Those plates are being replaced by the tapered spacer.
Three more superspeedway races remain in 2019, including the April race at Talladega. The Cup Series will return to both tracks before season's end, with a second race at Daytona on July 6 and another race at Talladega on Oct. 13.
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