Contested over 400 laps on the 1.5 mile (2.4 km) speedway, it was the 20th race of the 1966 NASCAR Grand National Series season.

[1] When Buddy Baker suffered a blown engine during the 44th lap,[citation needed] he was setting a pace of 145.291 miles per hour or 233.823 kilometres per hour; speeds that were unprecedented during the late 1960s.

Charlotte Motor Speedway is a motorsports complex located in Concord, North Carolina, United States, 13 miles from Charlotte, North Carolina.

The complex features a 1.5 miles (2.4 km) quad oval track that hosts NASCAR racing including the prestigious World 600 on Memorial Day weekend and the National 500.

Bruton Smith established the speedway in 1959, and it is considered NASCAR's home track, with many race teams based in the Charlotte region.