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TL DR: Use the flat washer. As @SolarMike said, one of the functions of the flat washer is to spread the load. The other function of a flat washer is to ensure the bolt (or nut in your case) doesn't gall (dig into) the aluminum (EDIT: I did misread the question a little. As the OP and Zaid pointed out, this is an aluminum block with a cast iron head. This ...

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