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Re: '94 grand cherokee: need exh.manifold/header leak & oil smoking help !!!
anti smoking stuff rarely works. These motors have an almost bulletproof bottom end so whilst you are doing the exhaust manifold, change the head. You can see if it is the valve guides/stem seals:
1. is the inside of the valve cover black?
2. do a compression test (compression tester cheap) if adding oil down the plug hole does nothing to increase the compression on the lowest cylinders then valve guides/seals are the problem.
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