Flint Engine Operations is a General Motors automobile engine factory in Flint, Michigan. The plant opened in 2002 and is named to replace the Flint North engine plant. The plant currently produces the small four-cylinder SGE and Duramax I6 engines. The factory receives cast engine blocks from Defiance Foundry in Defiance, Ohio and Saginaw Metal Casting Operations in Saginaw, Michigan. It replaced Flint North.