2019 Monster Energy NASCAR Cup Series rules 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).