ALAMEDA — The Raiders’ magic number on the ground this season is 70.

Oakland is winless this season in the three games it has rushed for 70 yards or fewer. But in the Raiders’ four wins, they easily have topped that total, including Sunday’s 34-20 victory over the New York Jets that saw them gain 74 yards on the ground by halftime.

“I think we definitely made a statement of what we want to be and how we want to run the ball,” running back Latavius Murray said Tuesday. “It says a lot about us and what we’re capable of.”

Murray finished with 113 yards in 20 carries, with 68 of those coming by halftime. It was the third 100-yard rushing game of his career, and the Raiders have won all of those games. In fact, they’re 7-0 when he rushes for at least 65 yards over the past two seasons.

This Sunday’s opponent, the Pittsburgh Steelers, is eighth in the NFL in rushing defense at 97.0 yards per game. That’s precisely what the Raiders rushed for in their Week 2 win over the Baltimore Ravens, and they have averaged 134.3 rushing yards in their other three victories.

Murray has rebounded from a tough two-week stretch in which he injured his shoulder in Week 4 against the Chicago Bears, the same game he was responsible for two turnovers. He failed to finish the game the next week against the Denver Broncos because of that injury. The bye week that followed helped, even though Murray still isn’t 100 percent.

“I don’t think anybody is ever healthy, but I feel good,” Murray said.

It’s evident in his yards per carry. Murray averaged 5.65 yards per attempt against the Jets and 5.67 against the San Diego Chargers the week before.

“I didn’t hesitate,” Murray said of his recent performances. “I wanted to get behind my shoulder and just one cut and be downhill. I think I’m able to do that, and it’s something I need to continue to do.”

The Raiders’ run game has received significant help not just from a sturdy offensive line that’s continuing to jell but also strong contributions from their wide receivers.

Seth Roberts might have only nine catches for 107 yards this season, but the second-year receiver — a practice squad player a year ago — rates as the league’s top run blocker among wideouts according to Pro Football Focus.

“I just try my best to make it happen for my teammates,” Roberts said. “Work together and look for the next man to me and just try to get my job done. I take pride in blocking.”

Michael Crabtree, who leads the Raiders with 40 catches and is second with 483 receiving yards, is also among the top 10 receivers in run blocking, according to PFF.

“It’s huge,” coach Jack Del Rio said Monday. “Without it, you can’t have the big play. In order for a play to go big, you typically have to have blocking downfield. Your receivers are going to be involved. When you have a group that’s working for each other like ours is, it gives you an opportunity.”