I had the same prob and here is what I had:
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That's worse case scenario. It could also be the intake manifold pan/gasket. The pan gasket blocks water ports that if leak puts it right in the valley. I think this is more of your problem. You would remove the intake any way to do the head gaskets.
Here's the other stuff. You should be able to torque them to 85ftlbs.
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The other thing you want to look into is the oil cooler on the driver side of the engine as seen here with the red ends.
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The orings get from ford or International. 2 o-rings on both ends of the tube, and they are both different. Gaskets you can get from auto parts store. Use thread sealent on the bolts and dry on the gaskets with the built in silicone bead.
PART #'s
It uses a total of 4 orings, 2 outers and 2 inners.
International part #s are for a bag of 2 rings
-thicker ring 1804414C1
-thinner ring 1807563C1
Here's the #'s at Ford call them too
Oil cooler O rings - Ford - 1C3Z-6K649-BA
Oil cooler O rings - Ford - 1C3Z-6C610-BA
Oil cooler gasket - Ford - E3TZ-6A636-G
Oil cooler gasket - Ford - E3TZ-6A636-H
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