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ARP head stud washers which didn't have as much surface area as the stock head bolts. In that event, the heads lifted and dented the heads, right around the washers, requiring it to be machined flat so that it will hold with larger washers. [ http://www.twinturbo.net/nissan/300zx/forums/general/view/2605355/PSA-RE--Head-Washer-Size--Head-gasket-Failure.html ]
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