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Hmm - I have 2 engines on my garage floor, a 2.5 and a 3.0. Looked at both where the Oil Separator/filler plugs into the side of the block. Just behind the lower hole is a boss that is machined on the outside and looks like it is drilled on the inside. It looks like something ought to fit in there. But if I get down on my knees and peer into the hole, it doesn't seem to go anywhere. It seems to be blocked inside. Is that what you're referring to? If so, I don't know what it's purpose is, but I don't think anything connects to it.
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