Cylinder Head Alloy?

I think the answer is "it depends" and for any particular head, unknowable. Alloys are chosen for manufacturability and given the heads were made for a very long time and during a period when alloy heads went from uncommon to normal as the production process and alloy compositions were improved, I reckon that there would have been multiple alloys used and several generations of casting tech too. The foundry is still there and still casting ally - you could ask :)
 
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