Dane Arnold from Scoggin-Dickey Parts Center compares three third-generation Hemi blocks. He discusses the differences between two iron blocks; the OEM Hellcat iron block weighing 204 lb (92 kg) and the Dart iron block weighing 242 lb (109 kg). Dane also compared those to a HHP Racing aluminum block weighing 118 lb. Besides the weight differences, he discusses main cap, bearing, and oil squirter differences.
Source: Scoggin-Dickey Parts Center