What is weight of stock 340 piston

MOPAROFFICIAL said
I keep remembering 740 grams when I think back.

Maybe that's the 340 rod I'm remembering

Well. Your pretty darn close! The shiny ones are a 'balanced 'set. All taken off the little end pad...? The rusty one is untouched. All the balanced caps weigh the same so the must have hit the big end with a flat belt sander