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I had good luck with using no extra gaskets or sealer on the valley pan. I just shot both sides with several good coats of the permatex copper spray, did the rtv on the pan rails. Also had to use permatex thread sealer on the intake manifold bolts because a lot of oil was getting sucked up the threads.

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Done it this way for 35 years. Never a problem. I use HiTack aircraft sealer on all my wet bolts.