Is there any difference in a zetec engine and doch engine...... any one know or are they both the same.......

doch i think you mean DOHC, the zetec is DOHC which means Double Over Head Camshaft

the engine with DOHC on them were the 1st of the zetec engines, sure it was them that had issues with sticky valves.

the later "16v zetec" were the remake of them to sort it.

 

IIRC anyhoo.