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stamped in the top of my piston is 25. i assume this means .25 over. i just noticed because i have a new oem and nothing is stamped.

Uh oh...that's not going to work very well. If you ordered this piston for a rebuild before you measured the current cylinder I.D. I guess you won't make that mistake again

Yes the 25 means it's the next size larger. And you could also measure it yourself, it wouldn't measure to 89.25 mm but you get the idea.