Mark Tutor will call the shots in the pits for Winston Cup driver Rick Mast, effective immediately, announced Junie Donlavey, owner of the No. 90 Ford.

"Mark has worked with Rick in the past, and the trust and communication that exists between them will help make this team better and hopefully get us to that next step," Donlavey said.

Tutor had been working on the CLR Ford with Derrike Cope. He has past experience with Petty Enterprises, Cale Yarborough Motorsports, Robby Gordon Racing and Loy Allen Racing.

Tutor's first race will be this weekend at Atlanta Motor Speedway in Hampton, Ga.