340 Manifolds, Reproduction, Any interest?

Treblig said
6 of one 1/2 a dozen of the other....The CNC is more accurate, repeatable and fast but more expensive because a three/four axis CNC machine cost way more than a manual machine and involves programming. Machining these manifolds "manually" incurs no expensive CNC machine nor does it require programming. But machining anything manually is much, much slower (cost/time), less accurate and labor intensive all of which drive the cost up. Moreover, if machined "manually", the compound angle between the engine/exhaust surface and the exhaust outlet/heat riser would require that the manifold be done in "stations". One station/machine for each machined surface. This was probably how it was done originally!! Each station would require a different fixture (more cost) to hold the manifold at the proper angle. When you make many thousands of manifolds the "station" method is very effective and that's probably why Mopar used that method.
So no matter which route you choose it cost too much to make a small batch. Expensive machine/programming OR expensive labor/time.

I do not wish to discourage "magnummopar", I was just shedding some light on the subject of machining!!

Treblig

I agree, no matter how it's done, it won't be cheap. Maybe China could do it?

As a side note, hardly anyone had NC equipment back in the 1960s. Maybe someone making Moon rocket parts did. I think I programmed my first NC 3-axis mill in around '76. People that had to make thousands (millions?) of duplicate parts had custom-built transfer machines made specifically for the part they were making. For these manifolds at one station the face would be milled, then the part moved the the next station where the holes were drilled using a muti-spindle head, next station would mill the outlet flange, etc... They still use machines like this today if the volume of parts can justify the investment.