It's not relevant any more because the service in no longer offered. But because you asked, an example or two. Edelbrock RPM or standard Stealth heads to 340 cfm were $1,750. Factory iron 906 heads to 340 cfm were $5,100.
Thanks for sharing. Is the difference in price driven mostly by how much harder cast iron is to work? Seems like the aluminum heads would be a no brainer at that price point.
