LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

93 Exhaust manifold Air tube thread size?

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Old Apr 3, 2003 | 04:26 PM
  #1  
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rao
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From: Naperville, IL
93 Exhaust manifold Air tube (air diverter valve) thread size?

I am looking for the thread size for the air pipe fittings on stock 1993 exhaust manifolds (I guess most people call them AIR diverter valves). It seems to be a very strange size - slightly larger than 1/2 NPT and it looks to be around 18 threads per inch. The left hand pipe cracked and I need to plug the holes while I search for a replacement tube.

It is the part attached to the manifold in the upper left hand pic here: http://csce.uark.edu/~jgbertr/rb/diverters.jpg

Thanks!

Last edited by rao; Apr 3, 2003 at 05:01 PM.
Old Apr 4, 2003 | 06:31 AM
  #2  
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rao
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From: Naperville, IL
It is M22x1.5 and a BMW oil drain plug will fit. NAPA part #704-1048

Last edited by rao; Apr 4, 2003 at 07:57 AM.
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