Im building a d motor for boost and have a y8 head and just got a z6 bottom end for free ans was woundering what bottom end would be better a6 or z6? And whith this setup will it be hard to tune it after boosting since its y8 head. I will be using a p28 ECU. This is going into a 90 civic hatch thats going to be upgrading to obd1 too if that helps at all. I guess im just woundering about issues with the two going together and tuning.

 

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