Originally Posted by
COCHYN
The silver top engine found in a Zetec S is a an "S" badged lump. Later it had the black top "SE" engine, which is much stronger IMO, and the Focus also has this engine as has been said.
These two engines are exactly the same, there is no difference apart from the colour of the cam cover. The early 1.4/1.6 focus (up to Y reg i think) had the silver cam cover, same as fiesta zetec-s, from then on they were fitted with the black cover.