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what exactly do you mean? hope you aren't trying to get a nice machine surface on your parts at home... unless you live in a machine shop
 

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It sounds like he is asking about the optimum surface finish on a milled head. Too smooth is not necessarily better for a gasket surface but I have no experience to say what is optimum. As far as flatness, that spec is in the FSM "engine repair" section and I don't know of any reason to deviate from that. I agree with the point above, that the OEM head gasket has been used for high boost/high power applications without problems.
 
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