Thanks very much for all the replies, guys. Yes, my main concern is that I'll need to make sure of the correct size for a replacement piston. Aren't over-sized pistons usually stamped on the top with the size? If nothing else, I'll take the bad piston to a shop, and have them measure it.
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Heck, you could pull that piston, take off the rings, put a new set on except put the top ring in the second groove, put oil ring where it belongs, and run it that way! There are two-ring pistons running on racetracks. Three is not a magic number. Just like four was not a magic number back in the day.
Unfortunately, after removing the pan, I can actually see daylight through the hole so re-using this piston is not an option.
Thanks again. I'm sure I'll have more questions before I'm finished!
Roger
