I'll start a new thread on this.
I ordered a head gasket set from AGKITS for my D19 diesel. It came yesterday. My shop manual for the D19 mentions separate fire rings to place around the tops of the cylinders after the gasket is installed. I did this one once before, about 25 years ago, and that's the way I remember it.
The new gasket set has just a regular composition gasket with the usual metal inserts around the tops of the cylinders. Before I email AGKITS, does anyone know anything about this? Did they change the gaskets? A buddy of mine who farms and is into AC's wondered about it, also.
I've heard horror stories about guys replacing head gaskets and immediately having another leak. I obviously don't want to go down that road.