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

Jessearent said
hell I would just be satisfied if someone could give me the accurate grams of one of those pistons/is .030" over with rings.

or you know, you could JFGI...

ETA: found it here: https://www.nhraracer.com/Files/Tech/NHRAAcceptedProducts.pdf

564 grams piston only

you're welcome