Because they are. A NASCAR car has to weigh a certain amount with no driver, and a certain higher amount with the driver in the car. For a very long time, the weights were 3400 lbs no driver, 3600 lbs with driver. If the driver weighed less than 200 lbs, the team had to add 10-pound lead blocks to the car to bring it up to spec. The important thing is, you can put that weight anywhere in the car. If you have a small driver like Jeff Gordon or Kevin Harvick, you can use the 50 lbs of lead to help adjust the way the car handles.
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