The shop I brought the 1976 Dodge Minnie Winnie to said that the exhaust manifolds needed to be planed and the gaskets replaced. Everyone I've talked to about it comments about the probability of broken bolts when taking off the exhaust manifolds. A thought that occurred is the possibility of using JB Weld expoxy as a way to seal off the leaks. The manifolds are aluminum? The block is steel?
 
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