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You obviously have another problem some where and it`s not the manifolds. I`m guessing it`s the exhaust side of the head is either coroded or who ever is changing the manifolds or gaskets, are not cleaning things very well. Maybe both. If you can afford it and really want to solve the problem I would pull the heads and have the exhaust side milled enough for a clean surface. Probably just have the heads reconditioned while they are off. I`m a firm believer in preventive maintainance. Or, buy another set of heads, J,G, Ga etc, have them reconditioned and have the exhaust side milled. Find another set of manifolds, or machinest, or buy a set of new reproduction WZ manifolds.
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