Water Ports

Revision as of 05:44, 8 June 2012; view current revision
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Coolant passages are below the intake ports in some A-series Cylinder Heads. They can be large holes or small holes.

Overview

• A12GX has Four Large coolant holes, one beneath each inlet

  

• Other heads have either no coolant holes, small ones, or a mix:

  

• Standard Datsun 1200 heads have no coolant holes on the intake side.

Interchange

A-series heads will interchange with either dry or wet Intake Manifold with the following caveats:

• If the intake doesn't have coolant passages, tap the head's coolant ports and install plugs

  

• If the intake does, but the head doesn't, cold-weather starting and cold-idle may suffer due to insufficient heat. However, warm-engine operation should be OK.

  

Directions for plugging the cylinder head with blind plugs: