i have searched for some time now on the difference between 4.6 romeo and windsor piston rings. Engine builder magazine said windsor has a shallow top ring groove on the piston and romeo has a deep too ring groove. When i look up part numbers they come back the same on ring sets. I would think back clearance would be excessive if windsor size top ring was used. I have a set of rings that are apparently windsor because they are narrow compared to the factory ones i had. Has anyone had this issue or know if they are ok to run?