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He wrote when you do a engine rebuild.
I presume then he is going to take the head off. Just take it to a cylinder head place and tell them they must inspect the valve seats.
If they are not made for unleaded fuel, tell them to put in new one's that will be unleaded compatible.
I also did some research here in South Africa.
A old Nissan mechanic told me that I must not use unleaded fuel.
The valve seats as dodgeman mentioned are not correct for this application.
I must change it to hardened valve seats and then it will be fine.