Re: What years had the PAIR system?
The simple solution would be to insert a penny in the hole then fill with JB weld. file off the excess and your done. GM made these manifolds with a special thread specifically to discourage removal of the tubes. (EPA) remember those guys. Welding the nuts also works but usually removal from the manifold bends the nuts unless you have a 18mm flare wrench. Good luck.
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