Colorado coach Jon Embree spent four years in the 1990s coaching defensive linemen in Boulder and learning how much of an impact they can have on the success or failure of a team.

Defensive linemen are considered a priority for the Buffs in the 2012 recruiting cycle and Embree is beginning to hoard them. He received his seventh oral commitment from a defensive lineman Friday when Samson Kafovalu pledged to be a Buff.

Kafovalu, a 6-foot-3, 245-pound defensive end from Arlington High School in Riverside, Calif., is considered a three-star prospect by both Rivals.com and Scout.com. He is the fourth defensive end in the class.

Embree and the Buffs will go into spring football with just eight defensive lineman on the roster, three of whom are walk-ons, unless one or more of the commitments is able to enroll early.

Kafovalu is the 20th overall member of the 2012 CU class and the eighth player from California to commit to Embree and his staff. He chose the Buffs over offers from many of the other Pac-12 Conference schools, Boise State and Nevada.

CU is expected to sign at least 28 players to national letters of intent Feb. 1.