Can anyone tel me how to identify the cc of a zetec engine ie 1.6 or 1.8?

Iv jus bought an s-reg escort and was told it was a 1.6 but the log book says 1796 wich im guessin means its a 1.8. The dvla have allready cocked up wen the previouse owner changed address they added an extra keeper on so i thought mayb they have cocked up with the cc on the logbook.

Is ther any visual signs or marking that will allow me to find out?

Thanks
Craig