Mechanics apply with in

Yup, you have to replace the head bolts. I just put heads on my 2004 Ranger Josh and it has the 3.0 V6. It was the first one of those I have done and it was really easy. I hear the 4.0 is even easier. Also, there is a special procedure for torquing the head bolts. I also recommend coating the head bolts with high temp sensor safe silicone going back together. Ford recommends dry, BUT I have done it like that for years with great success. A lot of times some of those head bolts will break coming out and the silicone not only prevents that, but also seals any head bolt holes that go through into the water jacket if there are any. The silicone on the bolts will effect the torque somewhat, but it will not be enough to be a concern. The important thing is to follow the recommended tightening deestruckshuns and sequence. The upper intakes are almost the same on the 3.0 and 4.0 and I can tell you I had mine down to the lower intake with valve covers off in less than an hour. It's not too bad a job. what is a little bit of a pain are the accessories on the front of the engine. I took the brackets loose from the heads and let the brackets and accessories just lay loose in the front. Disconnect the exhaust from the manifolds and pull the manifolds out with the heads. Much easier that way.