The running of Tony Dorsett and the passing of Danny White set up fullback Ron Springs for three touchdowns and Rafael Septien for three field goals today to boost the Dallas Cowboys over the St. Louis Cardinals, 30-17.

Dorsett rushed 129 yards on 16 carries and White completed 21 of 29 passes for 240 yards as this seventh consecutive Dallas victory over St. Louis kept the Cowboys even with Philadelphia at 2-0 in the National Conference Eastern Division.

Both the Cardinals and Cowboys opened with outstanding offenses on a 98-degree day that made Texas Stadium a steambath for the players and the 63,602 fans.

Springs scored twice from one yard and once from four yards. Septien kicked field goals of 47 and 32 yards as the Cowboys built a 27-14 halftime lead over the Cards, who will match 0-2 records with Washington next Sunday.

St. Louis' rookie quarterback Neil Lomax, starting his first game in place of injured Jim Hart, had his moments of brilliance. He threw a 62-yard touchdown pass to running back Willard Harrell and completed a 60-yard pass to set up a second score.

Dallas posted its 11th consecutive regular-season victory at home. Dorsett recorded his 22nd game with 100 yards or better on the ground and his fifth against one of his favorite patsies, the Cardinals.

White completed a 10-yard pass to Dorsett and a 55-yarder to Butch Johnson to position the Cowboys for Springs' first touchdown from a yard out. The Cardinals came back to 7-7 in the first period on Lomax's first NFL touchdown pass, the long gainer to Harrell.

After a St. Louis onside kick failed, White completed a 12-yard pass to Johnson and Dorsett ran 18 yards before Springs scored from the four. St. Louis never caught up again.