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If I were you, I would take the head to a local machine shop and have it pressure checked. It only costs about $30 and it is cheap insurance that the head is not cracked. I am working on a '78 280Z right now that we thought was a blown head gasket after doing a leakdown test. After removing the head, there were signs of a blown head gasket. No problem, so I thought. I took the head in for a valve job and the machine shop found cracks in 2 of the combustion chambers. I hope that this is not the case for you, but it would be a good idea to check it out anyway. Also, inspect the block for cracks. This is extremely rare on Nissan L motors, but it does happen. I don't think you should go to the trouble of having it magnafluxed, just give it a good look. Also, check the water jackets in the intake manifold around the carbs. You may have a leak there. BTW, get that hose out of the way of that return spring permanently!!! Good luck!!!

Ian
 
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