Ok, I have had my fb for almost a month now, and i've noticed something thats kinda disturbing. It takes forever for the radiator to cool off. the engine doesnt run hot, it just keeps pressure for a long time. anyone else got this problem?

 

replace your radiator cap...

also, if you don't have the stock thermostat with the small hole in it, that could be causing part of the problem (unlikely, though)

 

If the engine is not running hot or overheating, I wouldn't be too concerned. With it still holding pressure, it's probably a good sign...meaning no internal/external leaks. The car goes thru a "hot soak" stage after shutting off the engine. The coolant flow stops and the engine temp will rise before it starts cooling off. Other factors would effect cooling is outside temperture. If it's 100 deg outside and you park in a garage, it will take longer. I know with my car after driving it will actually heat up my 2 car garage.