The title describes a quality product designed for the task.
These L92YC spark plugs are as recommended by the MGBV8 manual and they are a quality spark plug designed for this 3.5Lt engine for maximum performance. I have bought from the spark plug company before and know that they have proven experience in this field. The plugs are not fitted to the car yet but I am certain they will be perfect. When I need anything ignition connected, I will always come back to this company.