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ALSO...this non egr aftermarket intake manifold i am using came with specific intake manifold gaskets BUT they were missing the square hole in the middle of them...so i cut a square as best as i could so that coolant would be able to travel through that channel as it would have with the stock intake manifold/cylinder head. i hope its not somehow breaking through that and leaking into the cyinders...
I am not sure if this is coolant, I think this may be (gm) in general a cutout/actual "blankoff"plate that that could be closed or opened for the choke. I have seen these wtih a sliding square blank off plate that ws for such applications.
Not knowing the condition of the block/all engine, best i can do, and best of luck!
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