Pistons specs question for 340 build

But it does make sense that if you remove material from a piston it would be stated as a negative value. I think the calculators for CR need the +ve values as it's CR that is going to be the end result and increasing volume decreases the CR.

But anyway, not wanting to sound like a broken record (and yes I grew up as a school kid buying Alice Cooper and Led Zep records for $4 each...), I'm hoping that someone reading this thread knows if the DSS Racing pistons are lighter than the popular KB Hyper's. I have read that the DSS are rated as on the heavy side for a forged. And I know the KB's, even though technically a cast piston , are lighter than the stock ones. But I need some numbers hopefully and I don' know why manufacturers don't post the weight of their pistons in their specs - well maybe the top dollar ones do but I haven't seen any weights for shelf pistons.