Harvick, who will start from the pole Sunday night in the NASCAR Sprint Cup race, took the lead on the 37th lap and ruled the 1.54-mile tri-oval for his third win of the season in 11 races.
Kyle Larson, who started second, finished third. Kyle Busch was fourth, and pole-sitter Chase Elliott fifth.
There was only one lead change, no crashes and two yellow flags, including one after light rain began to fall on Lap 121. Cars ran 13 laps under caution before the race resumed.
Elliott led the first 36 laps.
