This is the story..last year it was overhaul by the nissan bousted in my country..and from the purchase paper,its genuine nissan cyclinder head..and after a year..it got symtoms of head gasket blown/crack head..so pull of the head..and i notice the "new" head is using a 2notch(which is thicker than standard)..and by the number on the head..its like being rewrite..so im suspecting that they are using my old head last year by rewriting the new engine number and and shave it then using a thicker gasket..so im curious..just my theory..


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