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If you are talking about the plug on each end of the cylinder head it is to drain the oil from the high pressure oil galleries in the head. So if that is leaking you can pick up a new plug and O ring kit from the dealer to replace it.
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96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages,Dark Toumaline, add a leaf,Dale's TYMAR,and HX hose, downpipe, coolant filter
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