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I cannot state that this works because I have not had to remove a head, but it is what I've done with my heads, cast iron and aluminum, on two engines.
http://www.stefs.com/bandb/products/...washerstep.htm
To me it is intuitive, if you keep the bolts or studs centered in their holes, then there should be little corrosion or electrolysis that impairs head removal. I also used anti-seize on the shanks as added insurance. Be aware, you have to buy a special bit to drill the heads to accept the washers.