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Re: Need help with Pontiac 400 6x heads
What was covering that port before you took the manifold off?
Is the manifold installed backwards?
It might be possible this intake was designed to run dry, that is to not have coolant circulate in it. If this is the case, it may have used an intake gasket designed to 'block off' the coolant passage. I do not know if such an item is available.
However, running a street engine with no coolant heat sounds like a recipe for carburetor icing, so I could be wrong on that.
You might be able to fabricate a tiny block off plate and braze it into place, over the coolant passage.
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