I am pretty sure it is also going to be renewed, so a rebore and new pistons. #2 This is a thing I have sitting in the shed and I have not been sure as to what I was going to do with them. These are a pair of GT40P cylinder heads. Personally I don't know much about them. Ford I believe used them on their 4x4 and light truck like the F150-350, and they seemed to have a better breathing ability. They used them on Explorers and a few other vehicles but I am not sure about what they were.