General Motors is expected to announce Friday it's cutting about 170,000 vehicles from its planned production this year, closing factories for as long as nine weeks this summer as the automaker works to dramatically toughen its restructuring plan before a June 1 government deadline. At the same time, the White House is continuing to keep up the pressure on Chrysler and Fiat SpA to win concessions and make a deal before an April 30 deadline or face a likely bankruptcy filing.
