4.9 intake manifold
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So common that I have yet to hear of an intake manifold leaking oil on the 4.9 
valve covers.... I have heard a couple cases, hardly any at all though.... so I would say uncommon, thats not to say it dosn't happen though
valve covers.... I have heard a couple cases, hardly any at all though.... so I would say uncommon, thats not to say it dosn't happen though
The most likely source of oil pooled on the intake of a 4.9L manifold is from the power steering pump.
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