BRISTOL, Tenn. -- NASCAR made a flurry of procedural changes ahead of its first Cup race on dirt since 1970.
Bristol Motor Speedway converted its facility into a dirt track in an experiment on a revamped 2021 schedule.
It marks the first dirt race for the top series since 1970 and NASCAR is concerned it could be a disaster.
The stock cars proved too heavy for the dirt and tire wear dipped to dangerous levels during practices.
NASCAR the day before the race said it was making pro-active moves to save the Sunday's show.
![NASCAR Bristol Trucks Auto Racing](https://ewscripps.brightspotcdn.com/dims4/default/b5141af/2147483647/strip/true/crop/5472x3648+0+0/resize/1280x853!/quality/90/?url=http%3A%2F%2Fewscripps-brightspot.s3.amazonaws.com%2Fa7%2F0b%2Ff4cbeb964987962bba18dceb855a%2Fap21086791210757.jpg)
Wade Payne/AP