Edelbrock RPM head casting flaw

The "How its Made" series did an intake from the Edelbrock foundry. It was all scrap Aluminum! Probably just for the show, but it showed a bunch of scrap being melted down and poured/machined into a Performer RPM for a 302 IIRC. I cant find it on youtube, but there is one for Wilson CNC billet intakes. Probably 356