my water pump went on my 1800 si and my piston inbedded in the bore
would a standard 1800 mk4 head fit on my mk5 1800 si zetec

 

mk4? Im guessing youre talking about escorts here, they didnt do a zetec, or a 1.8 in the mk4..
si just stands for the interior, nout to do with the enigne.
but anyway all the 1.8 zetec heads are the same, silvertop anyway, bar the 130ps one from the xr3i and the rs1800i fiesta