Results of my intake manifold gasket leak investigation:
This is the water passage and intake port above cylinder No. 5. There was no leak here, I wanted to show it because I couldn't believe what I had found.
This is the water passage and intake port above cylinder No. 1. Definitely a leak here!
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This is the corresponding water passage and intake runner on the manifold above cylinder No. 1.
I'm curious as to the cause of this. Is it really the fault of the FelPro 1250 gasket or is it poor preparation and installation technique?