As I mentioned, the repops are patterned off an original used as a mold. OEM's haven't been any better and I've seen more than a few. We've even talked about how the OEM cast iron intakes have been pretty ugly in the port area.
Doesn't really matter this day and age where it's cast, given the fact that most of your aftermarket aluminum heads everyone covets are cast over seas now anyway, and the finish work is done here. It's really not the casting that is the problem, in fact some of the aftermarket head castings are actually pretty nice from over seas. It's the finish work that is most concerning.
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2019 Pontiac Heaven class winner
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