I have a pair of the Mopar Performance heads that I just weighed, 77.8 pounds. I believe these are from at least the 2nd vendor that did them. Maybe Zippy can tell by the castings which ones they are. I also had a pair which I believe were made before these which I will post a picture of below. They are definitely different castings than these are, but had the same part number. Unfortunately, I never weighed those.