I would not feel comfortable removing any weight from those pistons. I'd try to find a better set. ARe the original pistons too far out of spec to reuse? I have re-used my benz pistons at least 75 % of the time when going through a motor. There are specs for measuring wear and determining if its acceptable.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.