Lower intake manifold gaskets. Usually leak coolant externally, but if
they're left alone long enough they'll leak internally as well. I have to
assume it was a design flaw in the gaskets themselves as GM released "new
and improved" gaskets to fix the problem.
Ian has some pics of the old and new gasksts side by side, if he's reading
this maybe he can re-post the link?
The only real difference appears to be the metal re-enforcement around the
bolt holes. The gasket material is a different color, whether that actually
means something, I don't know.
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