I am dealing on an OS .46FX engine and the present owner (wife of a deceased modeler) doesn't know if it's ringed or ABL. I'd like to know before I buy it as it will make a difference in what I offer her for it as well as how I break it in. It looks like tower is offering only a .28 size and a 1.60 size. The small one is ABL, the big one ringed. What was the .46?

Non ringed engine. ABL liner.

Thank you, sir.