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You can buy a NEW shortblock from Nissan for $3K and just have your heads reworked. It will be as reliable as your Z when it had 0 miles on it. Your second option is to build your motor. I personally would like Mike Smith to build my motor if it ever needs it. :-) These are the only two options I'd consider. For every decent story you hear about JDM motors, you hear one bad one...too much risk. For a little bit more money, you can have a new factory shortblock.

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