I know the 2.9L and 4.0L OHV heads are prone to cracking, but I have never heard of this being a problem with the 3.0L heads. Does the 3.0L share this design/manufacturing gremlin?
The 3.0 is cast iron block cast iron head so it shouldn't have problem unless you really over heat it or drop the head!!
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86 fs bronco 302 auto 33x12.50 at rusty but trusty!
04 Ranger edge 3.0 5 speed auto 4.10
Before posting fuel related problems Run a couple of bottles of dedicated gas line dryer through IT!!!!!!!
There now I don't have to say it every time!!!!