DETROIT (AP) _ General Motors plans to invest $332 million into four factories in three Great Lakes states to build new, more efficient engines and transmissions.
 
  GM says the spending at plants in Bedford, Ind.; Toledo, Ohio; and Flint and Bay City, Mich., will allow the company to build a new V-6 engine, a new small motor and new eight-speed automatic transmissions.
 
  The company also added $46 million to a prior investment at plants in Romulus and Saginaw, Mich. to build the new V-6.
 
  No jobs will be added, but GM says the investments preserve 1,650 jobs at the six factories.
 
  The investment also will help GM build more six-speed automatic transmissions as auto sales continue to rise in the U.S.