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73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: LarryC on January 09, 2006, 09:51:00 pm

Title: Air Injection Exhaust Manifold Plug Size
Post by: LarryC on January 09, 2006, 09:51:00 pm

Does anyone know the size and thread pitch to plug the exhaust manifold holes for the air injection hardware on a 74 350?

Thanks,
Larry

Title: Re: Air Injection Exhaust Manifold Plug Size
Post by: DnStClr on January 11, 2006, 12:35:00 am

Larry, try a 1/4" npst. (nat'l pipe straight thread)  Naturally, you always want to use antiseize.