Edelbrock says Made in the USA but "Made in the USA" isn't a guarantee all the components used are. A lot of castings come from China or overseas. Heads like ProComp and Speed Master are good casting quality, its the components and assembly quality that come into question. I have a set of Speed Master heads on my 340 and the castings were as good as the Ford Trickflow, Ford Motorsports, and Edelbrock heads I've used in the past. Buy them bare and have a quality shop put quality hardware in them and you'll have no worries.
