Tennessee left tackle Lance Heard is out for Saturday night’s game at Oklahoma. The Vols ruled Heard out in Friday night’s availability report after listing him as questionable the previous two days. Heard missed last week’s game against Kent State with an ankle injury. No. 6 Tennessee (3-0) and No. 15 Oklahoma(3-0) are scheduled for a 7:30 p.m. Eastern Time kickoff at Oklahoma Memorial Stadium in Norman. Redshirt senior Dayne Davis is expected to replace Heard at left tackle. The Sooners opened as a 5.5-point favorite over the Vols in early betting lines released during the offseason, but Ten…