You can try driving them up with a jack or down with a post. Before that or between you can try a diesel/ATF mixture, your favorite rust breaker, or any other dozens of other people's favorite.
If it looks quite stubborn, you can burn the mixture in the holes to give some thermal cycling to allow the penetrant to sneak deeper; also, if you try wacking the piston just after the flame goes out (may want a rag around the post to protect yourself from any hot residue), a cold piston and warm sleeve should break easier.
See if you can get a pair to move up (a jack is a good option), then removing the caps on the other two you can drive them down putting force on only one at a time.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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