I have a buddy that used to work for GM. He told me the best thing to do is spray the block rails with spray adhesive as well as the block side of the gasket. The adhesive holds the gaskets in place and you can put a bead of silicon or permatex #2 on the pan side of the gasket. Use silicon in the corners of the pan gaskets. Just make sure the mating surfaces are nice and clean before using the spray adhesive. Since he told me this I do it for my gaskets as well. It works great.
Blaine
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