intake manifold leak

Well, before I get to the sealant, I chase the threads for the manifold in the heads, I clean the head and intake manifold mating surfaces until they are exceptionally clean. Then I check the mating surfaces (heads & manifold) with a straight edge to ensure they are flat, no burrs, etc. Next I trial fit the manifold to the heads, without gaskets or sealant to ensure they will bolt up correctly when I do assemble them. Check for clearance at the tappet cover bolts, for example. (did you replace this gasket first? If not, now is the time.) I check that the manifold bolt holes align properly and the bolts drop thru into their respective holes and thread in correctly. Then I pull the manifold off, re-clean all surfaces a final time and apply several coats of permatex copper spray to the gaskets. After the final coat is tacky, I install the gaskets and manifold. I also apply a little sealant to each bolt as some of them are exposed to the intake system and they must be sealed or you will have vacuum leaks. There are three different lengths of bolts used, so be sure you are installing the correct bolt length into each bolt hole. Torque according to the IH service manual. Re-assemble the remaining components to the manifold as required. Carb, thermostat, egr valve, etc.

So to answer your question: permatex copper spray-a-gasket.
 
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