Engines with iron block/aluminum heads like zetec are more prone to head gasket problems (related to overheating) than all aluminum or all iron because of the different metal expansion properties on either side of the gasket creating shearing forces.

1999 Amazon Green SVT Contour (#554/2760) "People demand freedom of speech as a compensation for the freedom of thought which they seldom use." -Soren Kierkegaard (as posted by Jato)