Found it interesting, even though there is a slightly negative Bama slant.
http://www.sbnation.com/college-football/2014/3/6/5475854/nfl-combine-high-school-40-yard-dash-times
http://www.sbnation.com/college-football/2014/3/6/5475854/nfl-combine-high-school-40-yard-dash-times