Ross Chastain seen at the Iowa Speedway on Sun., June 16, 2019, in Newton, Iowa. His victory was overturned after his truck failed a post-race inspection. Getty

Newton, Iowa — NASCAR overturned a victory for the first time since 1960 on Sunday when Brett Moffitt was declared the winner of the Truck Series race at Iowa Speedway after Ross Chastain's No. 44 truck failed a post-race inspection. Chastain led the final 141 laps of the 200-lap race.

But series managing director Brad Moran said the No. 44 was too low when it was measured with NASCAR's height sticks, which have color-coded markers to denote proper height. Chastain's team has until noon Monday to appeal the decision.

"The height sticks have warning yellows in them and reds and it was right off of all of them, so unfortunately it was extremely low," Moran said.

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The disqualification was the first under strict new rules put into place at the start of this season to deter the culture of cheating — and it delivered a much-needed win for Moffitt, a native Iowan racing at his hometown track.

"I think, for the integrity of the sport, it's the right thing to do," said Moffitt, who never led a lap in the race. "Obviously I came out on the good end of it. If I was in Ross's shoes, I wouldn't be too thrilled about it."

Ross Chastain, driver of the #44 TruNorth/Paul Jr Designs Chevrolet, seen June 16, 2019, in Newton, Iowa. Getty

The last time NASCAR disqualified an apparent race winner was April 17, 1960, when Emanuel Zervakis' victory at Wilson Speedway in North Carolina was thrown out because of an oversized fuel tank.

NASCAR announced in February that thorough post-race inspections would take place right after the race at the track instead of midweek at the sanctioning body's research and development center outside of Charlotte.

Winning teams found in violation of the rules in previous seasons were penalized with post-race fines, point deductions and/or suspensions. But drivers didn't have victories taken away from them until this year.

The decision could prove to be devastating for Chastain's season.

Chastain recently switched the championship he'd compete for in 2019 from the Xfinity Series to the Trucks, a risky move that left him at the bottom of the standings. The apparent win at Iowa meant that Chastain would only have to finish 20th or higher in the Truck standings to receive a playoff berth — and the driver nicknamed "The Melon Man" was so thrilled about it that he smashed a watermelon to the ground in victory lane.

Instead, Chastain was scored as though he finished last, and his victory and bonus points were stripped away. Chastain also lost the $50,000 he had won for taking first in the "Triple Truck Challenge," which spans three races. Saturday's race marked the second round of the competition.

Chastain, who spoke at a news conference after his apparent victory, could not be located for comment after his disqualification was announced.

Brett Moffitt races his truck during the NASCAR Truck Series auto race, Sunday, June 16, 2019, at Iowa Speedway in Newton, Iowa. AP

As for Moffitt, he said he was drinking beers in his motorhome on his way to the airport in nearby Des Moines and was "mad as hell" about losing when he got the call informing him that Chastain had been disqualified.

Moffitt and his beer buzz were summoned back to the track for the second winner's news conference of the day.

"I went from drinking my sorrows away to being happy," Moffitt told The Associated Press.