Bobby Allison (left, in helmet) famously fights with Cale Yarborough (right) as Allison’s brother, Donnie, swings his helmet at Yarborough after the 1979 Daytona 500. Donnie Allison was leading the race on the final lap when Yarborough spun both of them into the infield. They started fighting shortly thereafter, prompting Bobby Allison to pull over and join. The incident drew great publicity for NASCAR, with many considering the 1979 500 the most important race in stock car history. (AP)
GALLERY: Classic Photos From The Daytona 500

Bobby Allison (left, in helmet) famously fights with Cale Yarborough (right) as Allison’s brother, Donnie, swings his helmet at Yarborough after the 1979 Daytona 500. Donnie Allison was leading the race on the final lap when Yarborough spun both of them into the infield. They started fighting shortly thereafter, prompting Bobby Allison to pull over and join. The incident drew great publicity for NASCAR, with many considering the 1979 500 the most important race in stock car history. (AP)

GALLERY: Classic Photos From The Daytona 500

Brad Keselowski clinched the Sprint Cup title at Homestead after five-time Cup champion Jimmie Johnson pulled out of the season-finale race because of a parts failure. The 28-year-old Keselowski claimed the first championship for longtime NASCAR owner Roger Penske and grabbed a title for car manufacturer Dodge, which is leaving the Sprint Cup series after the season. The championship was Keselowski’s first-career title. (Tom Pennington/Getty Images)
GALLERY: 2012 Sprint Cup Winners

Brad Keselowski clinched the Sprint Cup title at Homestead after five-time Cup champion Jimmie Johnson pulled out of the season-finale race because of a parts failure. The 28-year-old Keselowski claimed the first championship for longtime NASCAR owner Roger Penske and grabbed a title for car manufacturer Dodge, which is leaving the Sprint Cup series after the season. The championship was Keselowski’s first-career title. (Tom Pennington/Getty Images)

GALLERY: 2012 Sprint Cup Winners

Jimmie Johnson, driver of the #48 Lowe’s/Kobalt Tools Chevrolet, races to the checkered flag to win the NASCAR Sprint Cup Series Crown Royal presents the Curtiss Shaver 400 at Indianapolis Motor Speedway on Sunday. (Andy Lyons/Getty Images)
ESTES: Johnson ties Gordon and more thoughts from the Brickyard 400LONG: Junior’s turnaround continues with retaking the points leadGALLERY: Best photos of every 2012 Sprint Cup winner

Jimmie Johnson, driver of the #48 Lowe’s/Kobalt Tools Chevrolet, races to the checkered flag to win the NASCAR Sprint Cup Series Crown Royal presents the Curtiss Shaver 400 at Indianapolis Motor Speedway on Sunday. (Andy Lyons/Getty Images)

ESTES: Johnson ties Gordon and more thoughts from the Brickyard 400
LONG: Junior’s turnaround continues with retaking the points lead
GALLERY: Best photos of every 2012 Sprint Cup winner

Kasey Kahne, driver of the No. 5 Farmers Insurance Chevrolet, races past the checkered flag to win the NASCAR Sprint Cup Series LENOX Industrial Tools 301 at New Hampshire Motor Speedway on Sunday in Loudon, N.H. (Tom Pennington/Getty Images for NASCAR)
MARTIN: Wild cards, pit problems and other thoughts from LoudonMcCARTNEY: Who will nab the top seed in the Chase for the Cup?GALLERY: Best Shots of Every 2012 Sprint Cup Winner | Standings

Kasey Kahne, driver of the No. 5 Farmers Insurance Chevrolet, races past the checkered flag to win the NASCAR Sprint Cup Series LENOX Industrial Tools 301 at New Hampshire Motor Speedway on Sunday in Loudon, N.H. (Tom Pennington/Getty Images for NASCAR)

MARTIN: Wild cards, pit problems and other thoughts from Loudon
McCARTNEY: Who will nab the top seed in the Chase for the Cup?
GALLERY: Best Shots of Every 2012 Sprint Cup Winner | Standings

During the 1912 Indianapolis 500, Ralph DePalma drove one of the most dominating races in history after leading laps 3 to 196. Unfortunately, with less than two laps left, his car suffered pistol failure and was unable to continue. Joe Lawson would wind up winning, but DePalma and his riding mechanic wanted to finish the race. The two wound up pusing the car down the entire length of the frontstretch to the finish line. (Courtesy Indianapolis Motor Speedway)
GALLERY: Greatest Indianapolis 500 Moments

During the 1912 Indianapolis 500, Ralph DePalma drove one of the most dominating races in history after leading laps 3 to 196. Unfortunately, with less than two laps left, his car suffered pistol failure and was unable to continue. Joe Lawson would wind up winning, but DePalma and his riding mechanic wanted to finish the race. The two wound up pusing the car down the entire length of the frontstretch to the finish line. (Courtesy Indianapolis Motor Speedway)

GALLERY: Greatest Indianapolis 500 Moments