Kyle Busch is defending champion and a two-time winner at Kentucky, where Sprint Cup brings a 40-car field for this weekend's race.
Saturday night will see a second test of what could be NASCAR's future rules package. The first came June 12 at Michigan. Now, drivers return to a favorite test bed with smaller spoilers and splitters.
Lower downforce is stock car racing's trend du jour. More slipping and sliding; more changes of speed and leads in the corners; faster straightaway runs. Few drivers oppose the plans that in 2017 could be part and parcel of every track except Talladega and Daytona.