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Drivers must be eligible to take part in the specific series, depending on points and experience.There are limitations to engine and transmission changes during a race weekend.Teams can only make use of one car from the start of the practice to the end of the race, unless the car crashes out, in which case a backup car is allowed but penalized by starting at the back of grid.Cars have to display racing numbers on each door and the roof, as well as a large number of sponsor decals, including a series sponsor logo to be displayed as a header or banner on the windshield.There are some common rules that are widely known, including, but not limited to:

This includes super late models, limited late models, special custom-built cars, and heavily modified street cars.Īdditional to these basic rules in NASCAR, there are also rule books for each racing series which are exclusively available to members of the Association and aren't available to the public. Late Model: With varying rules depending on region or track, this class is the highest class where special rules of late model car construction apply.Tire width is limited to eight inches or 200 millimeters.

Super Stock: Building on the production cars in Street Stock, this class allows a bit more customization and engine modifications, with a power output of up to 500/550 horsepower.Street Stock and Pure Stock: Also known as hobby stock, showroom stock, or U-car racing, this class allows only street cars to be raced.

As with drag racing, rallycross, hill climb racing, and other popular motorsports, there are rules for NASCAR and various classes with slightly different regulations.

Download nascar blue flag with yellow stripe