TwinTurbo.NET: Nissan 300ZX forum - I believe you are reffering to the passage in the block.
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Subject I believe you are reffering to the passage in the block.
     
Posted by JonnyZ(SoCal) on January 30, 2012 at 2:05 PM
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In Reply To Cleaning water passage behind water pump posted by Coldfusown on January 30, 2012 at 01:52 PM
     
Message Occasionally the coolant passage for the rear cylinders (built into the block) had some blockage due to it's cast design.
To fix this, people have had the rear passage smoothed out.

     
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