Between the 122ci and the 121 ci ZETEC? I have gone to auto parts store and they first ask for a number of the VIN and since I have a new motor, they have to ask me if its DOHC or SOHC, I tell them DOHC...then they ask 122ci or 121 ci.... What is the differance and since when did they put the SOHC in the 'tour?
