So just to clarify, you want me to use thread sealant on the gasket itself?
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What has worked so far to stop the leak?
I believe that thread sealer will do the trick.
I would clean the manifold and head mating surfaces and the threads on the bolts and nuts with a good solvent - carb cleaner, lacquer thinner, acetone, or MEK. Before applying the thread sealer to the gasket and installing the manifold, I would drain the radiator to eliminate the coolant contacting the sealer , at least over night. After applying it to the gasket, I would let the sealer "cure" a little for about 1 hour, then I would apply the sealer to the bolts/nuts and install the manifold. Torque bolts/nuts to spec. FILL THE RADIATOR WITH COOLANT. Drive the truck for a couple hours - then recheck the bolts/nut
Gnarls.
