hi i have recently sent off 4 my logbook for my fiesta mk4 1.25 ghia x (first car ) and it has come back as a 1.4 (1388cc) how do i find the engine number to change the details at dvla. I believe that the car was originally a 1.4 ghia x and the engine has been changed since. What would happen if i didnt notify the dvla would i be in the s**t? The reason im asking is because i dont want to be driving my car around and then i get stopped and have a load of trouble. I just want to be on the right side of the law