Is this a knock-off...?
Plumcrazy:
You will probably appreciate this thread over at HAMB:
6-71 Blower casting from start to finish
Guy works in a big foundry, and goes through the whole process - from deciding to cast them, making the tooling, ramming sand & pouring metal.
Great pics and narration for anybody that wants to see how it s actually done.
As for that manifold, probably was made to be a Nascar unit, went straight to Summit to fill an order instead. Edelebrock will probably send you a sticker if you contact them.
B.