what to do,what to do.

traded for some stuff and 1 item is a 440 steel crank. no big deal i thought. miked it and it is .020 on rods, not too worried yet. drum roll.....030 on mains. ouch. then i thought, maybe i'll have mains turned down to 383/400 size for future 451. what do you guys think? around here it is about 150 to turn crank. save,sell or turn for future use? thanks