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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 just installed a whole new top end, look at signature for parts. I am using a counterclockwise waterpump. I started the car in the morning and as I was on my way to town and the temp was at 180 (I am using a 180 degree thermo) Then in under 5 second the water temp went all the way to 265. I shut the car off and coasted for a 100 yards and then turned the car on while driving and the temp gauge went back down to 170. Do I have the wrong waterpump on or maybe a sticking thermo? And could my hole engine be in trouble getting it that hot?