for whatever it's worth... this is what their websites brag .. i copied and paste
"Edelbrock Performance Cylinder Heads are indeed made in the USA, offering top-notch quality and performance. Crafted from A356 aluminum"
they also used the term "USA state of the art foundry" and it's in San Jacinto, CA. They say it's located there strategically for the climate to help the molding process.
