Well, it's cracked. How bad is it?

RustyRatRod said

What's it look like from the outside? How much from "the other side" is NOT cracked?

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The outside meaning the topside? There are no cracks on the top side of the block where the tube inserts if I am understanding you correctly. Not sure I am though. If you mean the underside, opposite the crack it seems to be ok.