[TR] TR6 air rail threads

[John Mitchell <jmitch@snet.net>]

      Does anyone know what size threads are on a late model TR6 air 
rail where it attaches to the exhaust manifold?  I'm thinking it's a NPT 
thread, but I'm not real sure.  I want to pick up a tap to chase the 
threads in the manifold after ceramic coating.   Thanks for any help.  
John Mitchell  76TR6   72 Stag

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