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Dale Earnhardt Jr. answers questions during an interview at NASCAR Daytona 500 media day at Daytona International Speedway, Wednesday, Feb. 22, 2017, in Daytona Beach, Fla. (AP Photo/John Raoux)
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Brendan Gaughan makes comments at NASCAR Daytona 500 media day at Daytona International Speedway, Wednesday, Feb. 22, 2017, in Daytona Beach, Fla. (AP Photo/John Raoux)
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Jimmie Johnson, left, talks with a team member outside his garage during a practice session for the Clash NASCAR auto race at Daytona International Speedway, Friday, Feb. 17, 2017, in Daytona Beach, Fla. (AP Photo/Terry Renna) **FILE**
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FILE - In this June 30, 2016, file photo, Dale Earnhardt Jr. gestures as he speaks during a news conference before the start of a NASCAR Sprint Cup auto racing practice at Daytona International Speedway, in Daytona Beach, Fla. NASCAR has a new sponsor, a new format and a familiar face this year in its bid to rebound from declining ratings and attendance. The next 11 months will show if Dale Earnhardt Jr., Monster Energy and different rules can provide the needed jolt.(AP Photo/Wilfredo Lee, File)
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FILE - In this Oct. 7, 2007, file photo, a Confederate flags fly in the infield as cars come out of turn one during a NASCAR auto race at Talladega Superspeedway in Talladega, Ala. NASCAR is backing South Carolina Gov. Nikki Haley's call to remove the Confederate flag from the South Carolina Statehouse grounds in the wake of a massacre at a Charleston church, it said in a statement Tuesday, June 23, 2015. Though NASCAR bars the use of the flag in any official capacity, many fans fly the flag at their races. (AP Photo/Rob Carr, File)
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NASCAR America is changing, according to one veteran pollster. (Image form the Associated Press)
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An ad for NBC Sports' NASCAR programming, featuring the rugged, flannel-wearing Nick Offerman from "Parks and Recreation," has offended the gluten-free community. (YouTube)
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1969 FORD MUSTANG BOSS 429 - was a high performance Ford Mustang variant offered in 1969 and 1970.The Boss 429 (also known as the 'Boss 9' by enthusiasts) is arguably one of the rarest and most valued muscle cars to date. In total there were 859 original Boss 429s made. The origin of the Boss 429 comes about as a result of NASCAR. Ford was seeking to develop a Hemi engine that could compete with the famed 426 Hemi from Chrysler in NASCAR's Sprint Cup Series (then known as "Grand National Division"). NASCAR's homologation rules required that at least 500 cars be fitted with this motor and sold to the general public. After much consideration, it was decided by Ford that the Mustang would be the car that would house this new engine. The Boss 429 engine was derived from the Ford 385 engine. It used four bolt mains, a forged steel crank and forged steel connecting rods. The engine featured aluminum cylinder heads, which had a modified Hemi type combustion chamber which Ford called "crescent". These heads used the "dry-deck" method, meaning no head gaskets were used. Each cylinder, oil passage and water passage had an individual "O" ring style seal to seal it tight. The Boss 429 engine used a single Holley four barrel carburetor rated at 735 CFM mounted on an aluminum intake manifold that flowed well for its time. 1969 cars featured a hydraulic lifter camshaft while 1970 models got a mechanical lifter camshaft along with an improved dual exhaust system though rated power output stayed the same.
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Tony Stewart smiles as he sits in his car before qualifying for Saturday's NASCAR Bank of America Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, Oct. 9, 2014. (AP Photo/Terry Renna)
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Dale Earnhardt Jr. waits in the garage during practice for Saturday's NASCAR Bank of America Sprint Cup series auto race in Concord, N.C., Thursday, Oct. 9, 2014. (AP Photo/Terry Renna) ** FILE **
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Driver Joey Logano sits in his car before qualifying at NASCAR Sprint Cup auto race at New Hampshire Motor Speedway, in Loudon, N.H., Friday, Sept. 19, 2014 (AP Photo/Cheryl Senter)
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The casket of race car driver Kevin Ward Jr., is taken from a hearse before being carried into South Lewis Central School before a funeral on Thursday, Aug. 14, 2014, in Turin, N.Y. Ward died after being struck by NASCAR driver Tony Stewart's car during a race last weekend at a dirt track in western New York. (AP Photo/Mike Groll)
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NASCAR CEO Brian France, left, and NASCAR president Mike Helton, right, watch a video after France's grandmother, Anne Bledsoe France, was awarded the Landmark Award for the NASCAR Hall of Fame during an announcement in Charlotte, N.C., Wednesday, May 21, 2014. (AP Photo/Chuck Burton)
