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

kiwigtx said
A chalk line should suffice. Line up all the pistons on a bench and ping one line....easy. :poke:

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Just lay em back to a board to square em up, if you use masons line in the box, you'll get a tighter line. That's how I do it if it was a pallet stack of 2x4s... then just keep cutting