Pistons specs question for 340 build

like I stated before, seen it both ways but the DSS website says the dish is -16..Seems most state a dish as a negative cc
"...-16cc Small Block Mopar Dish Top..."

Probe states a 360 dished is -16
Ross piston states 340 Forged Dome volume is +5.5 cc

Chrysler Dodge Mopar 340 Piston Sets