No one has regularly driven the No. 3 since Dale Earnhardt's death on the track at the 2001 Daytona 500. But Dillon took the lead early and was on top for 192 of the 200 laps.
Roughly an hour after the trip to victory lane, the car failed the inspection for being too low in the rear. NASCAR said it would issue a ruling early next week.
The No. 3 was driven to fame by Earnhardt, who raced for the Richard Childress team. Childress is Dillon's grandfather and his team owner.
PRO FOOTBALL: The San Francisco 49ers say linebacker Aldon Smith suffered minor injuries during an incident Friday night in San Jose but is recovering comfortably.
A person with knowledge of the situation told the Associated Press on Saturday that Smith suffered stab wounds.
The team said it is in communication with authorities and would not comment further.
49ers general manager Trent Baalke says, "We are in contact with Aldon, and thankful that his injuries were not more serious."
Smith, 22, made a franchise-rookie record 14 sacks for most among NFL rookies last season, to go along with two forced fumbles.
Giants coach Tom Coughlin threw out the ceremonial first pitch before Saturday's game at Yankee Stadium. It was the second time the two-time Super Bowl winner got to throw out the first pitch.
Denny Hamlin agreed to a contract extension with Joe Gibbs Racing. Terms of his extension were not released, but he locked up a new deal almost 15 months before his current contract with JGR was set to expire.
HORSE RACING:Chapter Seven matched his own world record for four-year-old trotting horses over any size track, winning the Titan Cup in 1 minute, 50.4 seconds on Friday at the Meadowlands Racetrack.
Chapter Seven, driven by Tim Tetrick, beat Arch Madness by 23/4 lengths.
- Staff and wire reports