Blalock again manned the right tackle position in 2004. He was chosen first-team All-Big 12 Conference by the league's coaches and the Austin American-Statesman, adding second-team accolades from The Associated Press, Dallas Morning News, Fort Worth Star-Telegram and San Antonio Express-News. He led an offensive line that cleared the way for Texas to rank second in the nation in rushing (299.2 ypg), seventh in total offense (464.4 ypg) and 12th in scoring (35.3 ppg). Texas' 3,590 rushing yards that season was the third-highest total in school history.