Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec Do or Die

Not correct. You can use the 01+ block just plug off the two oil returns and the oil feed hole that feeds the head under the timing cover. when you place your 2.5L heads on the new block you'll see the passage that needs plugged. A couple years back there were a lot of writeups on this very issue and how to safely do it since the front feed is under pressure.