H4 Magnetos and their mounting flanges

I am now the proud owner of a minty H4 mag that i intend to put to use when I convert to mag ignition. It has an aluminum flange. Which is better, the cast iron mounting flange or the aluminum? Or does it really matter? I assume one of them was an upgrade. Which one?

TIA
Patrick
'49M
 
I don’t believe that one is an upgrade over the other. I believe it was more along the lines of supply and demand, vendor availability of raw materials and such. Possibly the war played a factor in the available materials.
 
Ah yes, the war effort. That thought never occurred to me. Makes sense.
Like rubber, I'm sure aluminum was also in high demand.
Thanks red.green.

Patrick
'49M
 

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