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			The stud was in the manifold that holds the cat-pipe on, not the head.  I've been spraying them with PB blaster for 2 weeks and that one nut was seriously rusted and the electric impact gun snapped it.  I was able to get all the other off and the drier's side manifold is now off.  I doubt I'll get the passenger side off tonight, but we'll see.  Probably starting tomorrow around 10-11.  I'll be needing some extra sleep after today.
		 
				__________________69 Z28 JL8 4 wheel disc brakes - being restored
 09 Silverado Z71
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