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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.
Not to rob your thread, but i just put the gt40 upper and lower intake on and mine is running really hot all the time too. How would i check to see if somethings blocking any tubes?
3) place the thermostat in boiling water, it shoudl open. THen pull it out, it should close.
This man knows... This always works, and normally solves the overheating problems, well anytime I've ever recommended it, if it doesnt open buy a new themostat.