Use a table ban saw to hack off the 340 piston crown .

PROSTOCKTOM said

For $295 you can buy a new set of 360 pistons here on the forum and then sell your 340 pistons. [FOR SALE] - High compression 360 pistons

However you obviously have more time to redo it again later than I would.

Tom

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Ok, after 5 months of hyatis, I believe only a piston with a tall crown/ dome would be a suitable for a hack. And that's only if the band saw has a good , adj grip, and your able to position the piston so it don't move.