The new Mopar Hemi block has been updated, cast with extra-thick cylinder walls, deck surfaces, inner lug bosses for head studs, and lifter bores. That means 60 pounds more than an original piece.

The new Mopar Hemi block has been updated with numerous improvements in oiling and structural integrity based on feedback from Super Stock racers and big name Mopar engine builders.

 The only "bad" news: it cosmetically looks nothing like the original casting or even the Mopar Performance Hemi replacement block from 10 years ago, and weighs 60 pounds more.

http://www.hotrod.com/how-to/engine/1603-win-this-hemi-part-1-the-572ci-short-block/