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The 1976 930 heads I have don't say RR350 on them but the 1987 930 heads I used to have and sold did say RR350 on them.
I wonder if they just didn't have that number in the 1976 casting molds at the time or if they didn't start using that alloy until sometime during or after 1976. I wonder if anybody actually knows or if it makes any difference on a street driven motor.
I think you're probably right that they started using it for the race turbo motors and of course all the 930's got it at the same time.
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