Quoth wolfie
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If you've got a Vortec 4.3 V6 or 5.7 V8, and you haven't replaced the LIMG yet, you will.
Whatever idiot at GM specified a plastic gasket for this application, and decided to run water passages through the manifold itself to boot, needs to be shot. Repeatedly.
See my rants at blazerforum.com for more details. (Same user name.)
I don't think Olds used those engines, though; they were more a Chevy/Pontiac/GMC division thing.
(ETA: Oh yeah, the heads warp too. If you take them off, you might not get them back on.)
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