OK, it's only a little diet, but these aluminum water pump housings will help your big block Chrysler or Hemi shed about 8 to 10 lbs. They include the appropriate accessory bosses for both early and late model engines.
Chrysler Mopar BB 413 426 440 HiRise Intake Manifold EFI Version [Satin]
Chrysler Mopar BB 413 426 440 HiRise Aluminum Intake Manifold [Satin]
Chrysler Mopar BB 413 426 440 HiRise Aluminum Intake Manifold [Black]
Chrysler Mopar BB 413 426 440 HiRise Aluminum Intake Manifold [Polished]