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I was wondering if anyone knew what size I should machine or port the intake and exhaust ports on the heads too? anyone have any tips or know of a good tutorial for doing this with z31 heads?
 

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i do believe theres a write up on z31.com and az-zbums site
 

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I have Ported the 300zx heads and have pics of what they look like use the gasket to gasket match and use a 80 grit finish on the intake and something fine like 120 on exhaust.. Let me kno if you want to see pics and flow bench #'s.
 

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Exhaust Port


Intake Port


You could open them up a little more, maybe. I wanted to keep things dependable, but, still increase the flow.

The only tutorial I can give you is, "choose your machinist well".
 
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