Having bought current manufacture aluminum tripower water necks for years from various vendors I can say that the surface where the neck bolts to the intake not being flat, and there being slag or casting sand blocking the passage inside the neck, can be a common thing. I just hold the mounting surface on a table top belt sander for a second or two and that usually fixes the mounting surface. A screw driver removes casting sand and a die grinder, as Mike said, may be necessary for slag.
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