1975 in NASCAR

The 1975 NASCAR Grand National Winston Cup Series was the 27th season of professional in the United States and the 4th modern era NASCAR Cup series. The season began on Sunday, January 19 and ended on Sunday, November 12. Richard Petty, driving the #43 Petty Enterprises STP Dodge scored his sixth NASCAR Grand National Series Winston Cup Championship. Bruce Hill was named NASCAR Rookie of the Year. NASCAR introduced a new points system in 1975, a system designed by statistician Bob Latford. For the first time, each race on the NASCAR Winston Cup Grand National schedule carried an equal point value, a system that would be used until 2010, with modifications in 2004 (a playoff system was added, and an additional bonus system), 2007 (an additional bonus was added) for winning races.

...
Wikipedia