The rules package for Speedweeks and the 61st annual DAYTONA 500 on Sunday, Feb. 17 will remain the same as past years with the use of a restrictor plate and tapered spacer to reduce the amount of air flow into the engine. The 2019 rules package will be implemented for the Coke Zero Sugar 400 on July 6 where cars will utilize only a smaller tapered spacer to restrict air flow into the engine, negating the need for a restrictor plate, which was first introduced in 1987.
