In Reply to: Re: Piston rings posted by Steve Dabrowski on January 22, 2023 at 16:51:47:
I suspect you are right, Steve. I've been looking at my library of dealer technical bulletins and I don't have one that specifically mentions why Ford dropped the 4th ring, but there are a few that document the continued evolvement of piston rings on the 8N, so it would appear that they were a work in process.