Advice on Replacement Heads

[Rudy123]

I have a '02 XLT 4.6L with 83K. About a month ago the #7 spark plug shot out while driving and pulled the threads with it. Was out of state and dealer repaired it with a helicoil insert. Truck drove fine for about 3K and now has MIL code for #7 missfire. I still have to do some tests but I am sure I will be needing to replace the head. First, do you really have to pull the engine to replace a head on these vehicles? If so, can someone give me a quick reason why its nesessary? With 83K, is it a good idea to replace both or can I replace one and get away without any problems? Does anyone know of a good place to get reman heads from? Sorry for all the questions in a row but trying to get an idea of what I may have to do. Thanks.

 

[Hitchhikingmike]

Wow thats scary to have a plug pop out. I dont know what to tell you. No experience here.

 

[crash594]

I have only heard of that on the 5.4. I would go to the F150 fourm. Those guys have been doing alot of mods and head changes.

http://www.f150online.com/forums/engine-24/