Can a SOHC be swapped for a DOHC in an 2002 ford focus?

Yes, a SOHC (Single Overhead Cam) engine can be swapped for a DOHC (Dual Overhead Cam) engine in a 2002 Ford Focus, but it requires significant modifications. This includes changes to the engine mounts, wiring harness, and potentially the ECU to accommodate the different engine management needs. Additionally, the transmission compatibility should be checked, as the two engine types may have different requirements. It's advisable to consult with a knowledgeable mechanic or specialist to ensure a successful swap.