The rules for the Daytona 500 are set by the National Association for Stock Car Racing, or NASCAR. The engine must have eight cylinders, a compression ratio of 2:1, a maximum displacement of 385 cubic inches and a performance package allowing greater engine torque without affecting the durability.
The allowable horsepower limit of the car engine is 725 horsepower. The race cars should use a carburetor and not a fuel injector. The teams need to fabricate the car with synthetic fibreglass composite material to meet the allowable length and width of the car body. The radiator pan has to be 38 inches wide.
At the rear of the car, the spoiler should not be more than 6 inches tall. The minimum weight of the car has to be 3,250 pounds. The allowable size of the fuel cells is 22 gallons. NASCAR does not allow teams to pull out the side skirts near the rear tires during the pit stops. A black flag is raised if the side skirt rule is violated.
A knob has been added on the dashboard to adjust the track bar. The teams should follow the posted speed limits on the pit stops and must park the car within the designated pit stall. A meeting is held two hours before the race to cover the rule changes. If the crew chief or the driver does not attend, the driver has to start the race in the last position.