Intake Threaded Hole Size?

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Intake Threaded Hole Size?

Mechanical Mechanical – General Tips, Problems, and Solutions, not related to the specific systems above

06-26-2007	#1 (permalink)
Ooooner Moderator Join Date: Mar 2002 Location: Concord, North Carolina Posts: 907 Classified Rating: 0% (0)	Intake Threaded Hole Size? There are two threaded holes under the carburetor on the intake manifold. One is for a vacuum line and the other is for the return of exhaust fumes from the exhaust pipe. (My GT is a 73) I am trying to find out what size pipe thread the lower hole from the exhaust pipe is because I am going to plug it. I have figured out that it is obviously metric and somewhere in the range of a 1/4" pipe thread. I am assuming this is a tapered pipe thread. Does anyone have any thoughts on the size thread and if they have ever plugged this hole? Thanks.

Roy Bell, 1973 Opel GT
Concord, North Carolina
Carolina Opel Club
OMC

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