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Originally Posted by QWKSNKE
Are you sure that all of the air has been burped out of the cooling system?
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It can take a long time to get excess air out of the system after you do a head swap.
I have found that they best way to eliminate having to "burp" the system is to flush the coolant system with one of the coolant flush systems you cn buy at the auto parts store (less than $5). Basically, you end up using the water pressure from the garden hose to fill the block/heads and push all the air out. You also get the benefit of flushing any dirt or debris that may have gotten into the block while doing the swap.
On a side note, if you do go this route, don't even try to hook up the T-fitting where they say to (at the firewall). On the Mustang 5.0L, the line from the heater core to the intake is too short and bent to do anything with. I have a peice of hose and a T-fitting made up that I put in-place from the water pump to the intake hard-line at the front of the motor. It doesn't have to look pretty since I just remove it when I'm done and replace it with the factory hose.