The 1970 Tidewater 300 was a NASCAR Grand National Series event that was held on Sunday, November 22, 1970, at Langley Field Speedway in Hampton, Virginia. The race car drivers who used General Motors vehicles would be humiliated at the end of the race because they failed to win any races during the 1970 NASCAR Grand National Series season. NASCAR was on a big remeasuring kick during that year. They found out that a lot of tracks were slightly bigger or smaller than originally advertised. Bristol and Martinsville still use the measurements that were discovered in 1970.