You say Sebring's battered old concrete runways are ... in Alec Ulmann's mind, a race track. From his inaugural 6-hour event in 1950 through the 31st (a 12-hour in 1982), Ulmann's course layout ...

It’s because much of the track is even older than the race itself – concrete laid in the 1940s when Sebring was pressed into service as Hendricks Army Airfield, a World War II training base.