The team announced Monday the additions to new coach Jim Mora's offense. Mora promises to increase the Seahawks' emphasis on running the ball.
The imposing, physical Willis, at 6-foot-6 and 315 pounds, was Seattle's fourth-round draft choice in 2005. The 26-year-old made all 10 of his career starts last season when the Seahawks' offensive line was beset by injuries.
Owens is a blocking specialist who played with Detroit last season. He was a fifth-round pick by the Lions in 2002. He has also played for Chicago, Cleveland and New Orleans.
Owens has started 16 of his 60 NFL games.