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Good question. I don't really know if there is that much difference between the US and JDM n/a engines, but there definitely is a difference between the 86 and 89 engines. I would just order the parts for an 89 usdm motor and then when you get it apart you'll be able to measure to see if there is any difference in the piston and bore diameter, etc. All these US specs are in the back of the BGB.
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