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Re: 72 Intake has rear water passages blocked
Yes, that is perfectly normal for the rear of the intake to be blocked like that. As geezer#99 described, with the way the coolant flows through the engine, there is no need for any side-to-side connection back there. And the only reason the cylinder heads even have coolant ports back there is to make the heads interchangeable, eliminating the need for left or right side specific castings.
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