TwinTurbo.NET: Nissan 300ZX forum - Also, found this on the Wiseco FAQ section:
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Subject Also, found this on the Wiseco FAQ section:
     
Posted by aliaZ on June 07, 2003 at 8:39 PM
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In Reply To Some people don't want coatings and coatings are not posted by MikeH(Twin GT35BB Incon Z) on June 07, 2003 at 08:24 PM
     
Message 11. What are the Anti-detonation grooves on the top ring-land and the Pressure-grooves on the 2nd land for?

The Anti-detonation grooves prevent carbon-buildup from locking up the top ring. They also help keep the air and fuel in suspension. The accumulation of gases that get by the top ring can unseat it. A pressure groove delays this action. This is why today's recommendation is to keep the 2nd ring end-gap as large or larger than the top ring end-gap.

     
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