Elliott Sadler and Rusty Wallace were the early leaders but a series of accidents cut down the field.
At the mid-point (250 of 500 laps) Wallace was still leading with Matt Kenseth and Kevin Harvick close behind.
Wallace and Jeff Gordon dropped off the pace because of mishaps by the 300-lap mark.
With 30 laps to go Harvick expanded his lead to 3.024 seconds.
The next Nextel race is scheduled for next Sunday at the Martinsville (Va.) Speedway.