Drew Allar threw for four touchdowns Saturday night and No. 7 Penn State limited No. 24 Iowa to 76 total yards and four first downs in a 31-0 Big Ten Conference blowout in University Park, Pa.Allar overcame rainy, chilly conditions to complete 25 of 37 passes for 166 yards in an efficient, mistake-free performance. The Nittany Lions (4-0, 2-0) played a clean game with no turnovers and just four penalties for 45 yards.Meanwhile, the Hawkeyes (3-1, 0-1) were just overwhelmed across the board. Cade McNamara completed only 5 of 14 passes for 42 yards and was sacked twice before being benched in the fourth quarter. The running game produced just 20 yards on 17 carries.Still, it was just 10-0 at halftime before Penn State put the game away with a pair of lengthy touchdown drives in the third quarter. Allar found Tyler Warren for a 2-yard scoring strike at the end of the second half’s opening drive that covered 75 yards and chewed up nearly seven minutes.That duo hooked up again with 1:01 left in the period for a 7-yard touchdown that capped a 12-play march of 5:50. After the Nittany Lions recovered Iowa’s third lost fumble of the night, Allar flipped a 3-yard strike to KeAndre Lambert-Smith with 12:19 remaining in the game.