Hello guys..i need to know from your experience about zd30 head engine..please look at the picture..ImageUploadedByMotorculture1393747851.237355.jpg is the engine seriel number being rewrite by a machine shop or not?because nissan agent said its a new cyclinder head..but why is the head gasket thickness is grade 2(2 notch) is it supposed to be using grade 1(1notch) unless the head is skimmed right?ImageUploadedByMotorculture1393748208.234288.jpg im just curious


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