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diy port n polish
https://www.thejdm.com/forum/viewtopic.php?f=61&t=1959
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Author:  jdm_180sx [ May 30, 2004 ]
Post subject:  diy port n polish

ne1 know how to do it the right way?
Author:  kotomile [ May 30, 2004 ]
Post subject: 

As far as actually PORTING the head, if you don't know what you're doing you can do more harm than good. A little polish never hurt anybody though, just going through the passages knocking down the casting burrs and imperfections with a sanding disc. I did this to a D16 head in high school and won a blue ribbon at the tech ed expo.
Author:  jdm_180sx [ May 31, 2004 ]
Post subject: 

thats cool but do you know if it gave the engine any gains?
Author:  kotomile [ May 31, 2004 ]
Post subject: 

maybe a little.
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