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It started leaking before you changed the thermostat and gasket or after? Did you torque the thermostat housing bolts?
 

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Look at it closely and be sure that the housing itself is not cracked.

I don't know about the 5.4's but Ford recognized a problem with the intake manifolds of the 4.6's of that era and put in place an unlimited mileage 7 year extended warranty for replacement of the manifold should it fail.

Try going to our home page and clicking on the gray/silve button marked (Bulletins) see if you find anything there.
 

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Make sure the thermostat doesn't shift out of it's inset while the housing bolts are snugged up, by holding it in place through the hose port opening w/ a finger.
 

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Get your hands on a coolant pressure test kit. Then, clean the area of any residual coolant. Hook up the kit, pressurize and look for leaks. Then tighten clamps/replace components as necessary.
 
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