I gotta see a .91FX ABN. I don't think they made them, maybe a .91 fan engine or something. Where is Baxter when you need him with OS history.

The liner peeling problem is fixed and was fixed in late 2000 or 2001 as I recall. The main culprits were the .40 & .46SF engines, along with the first run or two of the .46FX. When OS switched the .40FP from a steel liner-iron piston to ABN, they also had some peelers. I have never heard of an OS .61FX peeling.