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

Your to smart 340six..be quiet....unless you have some specifics about scats 4" forged crank . How much does the machinist remove and where, if useing 715 gram rods and bolts and stock TRW Forged flat top pistons weighing??? How deep and wide are the holes....or, hell I would just be satisfied if someone could give me the accurate grams of one of those pistons/is .030" over with rings.
Get get yourself a set of triple beams and start weighing em up, if Ya got em! Otherwise contact to manufacturers and if that's not possible because they're a discontinued piston start a separate post on them hopefully someone will reply with the correct information at this point your info is being buried in here