NO! NO! NO!
The older SHO was completely different from the V8 SHO. The V6 SHO was fully a Yamaha design, but the block was based on the old 3.0 Vulcan design. Nothing on the SHO V6 fits onto a Duratec.
The V8 SHO is essentually a 2.5 Duratec with two additional cylinders. The V is a 60 degree just like the Duratec. It includes a balance shaft to help make it smooth.
I don't know just how much Yamaha collaborated in the design, but the parts were all made in the USA and then shipped to Japan where Yamaha assembled it for Ford. At least that is what I remember reading when the V8 SHO was first introduced.
