Everything you need to know about the Southern 500 at Darlington

DARLINGTON, SC - SEPTEMBER 03: Crew members push the #21 Motorcraft/Quick Lane Tire & Auto Center Ford, driven by Ryan Blaney, through the garage area during practice for the NASCAR Sprint Cup Series Bojangles' Southern 500 at Darlington Raceway on September 3, 2016 in Darlington, South Carolina. (Photo by Jerry Markland/NASCAR via Getty Images)

Tonight's Bojangles' Southern 500 at Darlington Raceway is race No. 25 of 36 of the NASCAR Sprint Cup Series season.

There are just two more chances for winless drivers to claim victory and punch their ticket into the Chase, but a win at The Track Too Tough To Tame is always an extra challenge.

As NASCAR goes retro on Sunday night, here's is everything you need to about the Labor Day throwback event:

Green flag:

6:20 p.m. ET

Tune-in:

6 p.m. ET: Sprint Cup Series Bojangles' Southern 500

Race distance: 367 laps, 501.322 miles

Track size: 1.366-mile egg-shaped oval

Grid size: 40 cars

Forecast: Mostly sunny, zero percent chance of rain, high of 84 degrees

National anthem: Barry Williams (Greg Brady from "The Brady Bunch")

Grand Marshals: Richard Childress, Rick Hendrick and Mark Martin

Flyover: Two T-38s, the 49th Fighter Training Squadron from Columbus AFB, Mississippi

Defending race winner: Carl Edwards

Front row: Kevin Harvick and Brad Keselowski

Starting lineup: