Go to Auto Zone, they sell Right Stuff made by Permatex. This is what GM uses on their engines. I put my 6.5 diesel together using this and after over 100,000 miles no leaks except the main seals. It comes in a can resembling a whip cream can for around $15.00. This is not like the silicone gasket maker you buy in a tube. This replaces gaskets. Follow the directions by putting down a thin bead then assemble and tighten. Just make sure surfaces are clean. It is impervious to oils and anti freeze but not fuel.
TOM
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