The duratec has similar engine internal dimentions, the wrist pin diameter is the same, the piston CD is the same, the rod length is within a couple of thou, other than that nothing is honda about it. The engine that the 2.5,3.0l is like is the 4.6 cobra. The cam tentioners, lifters, followers, oil pump, valvesprings, retainers, valve locks are all the same, the way the engine is designed is nearly identical. So in reality the dura is the Cobra's lil bro.
