While many don't like to talk about the base engine/model, it is the biggest seller. The 4.0l SOHC is based on the old 2.6 german "colonge" V6 which was seen in the early 70's in cars. The engine was bored and stroked, and lost the pushrods to become a 4.0l SOHC which is in the explorer and will be in the 05 mustang. I am fairly shocked that the block is this old, but with a 60* block, and overhead cam, it should be a smooth engine. What do you think? I say it is a big step forward on the 3.8l, but I will have to drive it before I say it should be replaced with something newer... like a duratec.