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I coated the short gaskets and the surface they rest on.
Do you have to coat the long gaskets to the heads?
I used gasgacinch.
 

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Not usually, a little around the water openings would not hurt.
 

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The problem with the rubber and cork, is they tend to slip when tightened, and leak in the corners where the manifold sits. Run a bead of your sealer, about 1/4 of inch thick across both front and rear surfaces and throw the others away, be sure to lap some or the sealer up on the manifold gasket at the corners.
 
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