Position change on offensive line

In the same season where the Ravens added a new center in Matt Birk, they might have found new backup at that position. During the offseason, David Hale is making the switch from a tackle in college to a center in the NFL. Hale, a fourth-round pick in 2008, has been working with the second-team offense in minicamps. “He’s been attached to Birk the entire offseason,” coach John Harbaugh said recently. Offensive coordinator Cam Cameron seems to prefer more upright centers. Birk is 6 feet 4, and Hale is 6-6. Last season, Jason Brown started at center for the Ravens, and Chris Chester and Marshal Yanda both took snaps at center during training camp.