Thank you, dogdays. I've removed the piston and I'm taking it to my local, independent parts house for them to measure. The owner is an old-hand guy who knows everything. I'll have him order me a new piston, and install it on the connecting rod.

Also, I have no way of knowing if that 65k mile figure is accurate. For all I know, it could be 165k. From the looks of this piston, this engine may have more miles on it. Here are some more pictures. As you can see by the hole, this cylinder had no compression:





This doesn't look good at all:





The top ring is broken:




I'll keep you posted, thanks!

Roger