2019 NASCAR Cup Series rules package
The information below was posted for 2019. The package remained unchanged in 2020.
For 2021, Darlington and Nashville will run the lower horse power package.
Aero Elements
- Spoiler: 8” x 61”
- Splitter: 2” overhang, 10.5” wings at ends of splitter (near tires)
- Radiator pan: 37” in front tapered to 31” with vertical fences
- Aero ducts: Used at majority of oval tracks larger than 1 mile
Engine Elements
- 750 HP: 1.17” tapered spacer (Used at short tracks and road courses)
- 550 HP: 0.922” tapered spacer (Used at oval tracks larger than 1 mile)
| Track | HP | Aero ducts? |
| Atlanta | 550 | No |
| Las Vegas | 550 | Yes |
| ISM (Phoenix) | 750 | No |
| Auto Club | 550 | Yes |
| Martinsville | 750 | No |
| Texas | 550 | Yes |
| Bristol | 750 | No |
| Richmond | 750 | No |
| Talladega | 550 | Yes |
| Dover | 750 | No |
| Kansas | 550 | Yes |
| Charlotte (All-Star) | 550 | Yes |
| Charlotte | 550 | Yes |
| Pocono | 550 | Yes |
| Michigan | 550 | Yes |
| Sonoma | 750 | No |
| Chicagoland | 550 | Yes |
| Daytona | 550 | Yes |
| Kentucky | 550 | Yes |
| New Hampshire | 750 | No |
| Pocono | 550 | Yes |
| Watkins Glen | 750 | No |
| Michigan | 550 | Yes |
| Bristol | 750 | No |
| Darlington | 550 | Yes |
| Indianapolis | 550 | Yes |
| Las Vegas | 550 | Yes |
| Richmond | 750 | No |
| Charlotte ROVAL | 750 | No |
| Dover | 750 | No |
| Talladega | 550 | Yes |
| Kansas | 550 | Yes |
| Martinsville | 750 | No |
| Texas | 550 | Yes |
| ISM (Phoenix) | 750 | No |
| Homestead | 550 | Yes |
Misc.
- Enhanced vehicle chassis mandatory at all tracks
- Adding 3 long block engine seals in points races. These are in addition to the 13 short
block seals introduced in 2018. - 25% reduction in testing (3 organizational tests, down from 4; 3 teams at each Goodyear
test, down from 4).