Join Date: Sep 1999
Location: Austin, Texas
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Re: need to ID a part on my 258 I6
That must be an older block. All of the later model blocks I have seen are plugged in those locations. The rear one looks like some sort of early CTO, I have no idea what the front one is. If you are rebuilding, or just trying to get the engine running again, I would pull them and plug them with some brass plugs. Both holes access the water jacket and you don't want them leaking. Later model intake manifolds had water running through them and also many of the coolant related sensors.