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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I have an 87Gt running a 91 5.0 engine, The Thermostat is open or i don't have one i'm not sure... the engine temp will not rise over 140 degrees, and the local mechanic said this is the reason, I just bought the thermostat and the gasket for my car, have any of you guys done this before, if so what can i expect to find, and how hard is this to do.