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Head gasket or cracked (head/block). If you had
everyrthing "magged" prior to assembly and it checked out then it is probably a gasket. Put a bead of silicone around the water passage at the front of the manifold prior to assembly. If you can, prior to putting the manifold back on do a leakdown check on that cylinder (#5) to check the integrety of the head gasket.
The water passage on the intake manifold to the head can sometimes be difficult to seal. Be sure you have the correct gaskets.
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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