The shutout was the second straight for the Crimson Tide (3-0, 1-0 Southeastern Conference). The last time Alabama, which now has forced 12 turnovers this season, had back-to-back shutouts was against Vanderbilt and Kentucky in 1980.
AJ McCarron was 11 of 16 passing for 189 yards and a touchdown.
Arkansas (1-2, 0-1) had just 44 yards on offense at halftime and 137 for the game. The Razorbacks were held scoreless in Razorback Stadium for the first time since a 7-0 loss to Baylor in 1966.
Alabama, which struggled at times offensively in last week's 35-0 win over Western Kentucky, had no such problems against a reeling Arkansas team. The Crimson Tide allowed six sacks of McCarron last week, but none against the Razorbacks. Alabama gained 438 yards on offense.
Lacy had two touchdowns in the first half to help Alabama to a 24-0 halftime lead. His 10-yard touchdown run in the third quarter put the Crimson Tide up 31-0, and he finished with 55 yards rushing on 12 carries.
Kenyan Drake, TJ Yeldon and Blake Sims also added touchdown runs in the blowout, which was Arkansas' worst loss since a 70-17 defeat at Southern California in 2005.
Wilson's availability for the game was the subject of much speculation throughout the week. He missed the second half of Arkansas' shocking overtime loss to the Warhawks last week, and Razorbacks coach John L. Smith was noticeably vague about the first-team All-SEC quarterback's status leading up to the game.
The mystery continued before the game. Wilson went through warmups in full uniform with his teammates, and he took part in the pregame coin toss as one of Arkansas' captains.
Moments later, Wilson's role as a decoy became clear when he put on a baseball cap and headset.