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

RustyRatRod said

I say go for it. You seem hell bent, so why even ask for opinions? Use a bastard file to get the crank journals undersized, too.

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I went for it. No problem cutting off the dome on a TRW high compression piston and using it...saved a ton of money . The piston is now where it needs to be on compression with my cc.