I have a '72 V12 S3 that has an open 3/8" port on the front RH intake manifold. I need to close this but cant find the threaded fitting. Checked with SNGB but they don’t show it in their catalog. This is an EX/EM car, but I am trying to eliminate leaks. This is a BIG one. There is a threaded fitting on the LH rear intake so I know they existed. I thought it may be a 3/8 NPT thread but it is not.
Bob W, Spokane WA area
7S4830SA
can you post a pic of this - manifold position, are you able to access with a thread gauge, if reasonable easy access i do have a suggestion but will hold on that as i’m sure i’ll get negative response from some die hard posters
I had the same frustration of finding a threaded plug that would fit. I ended up using a non-threaded black plug made of a pliable synthetic material (can’t remember exactly what) with some silicon around the perimeter. It seemed to work okay, but has not been tested in service.
Thanks friend. SNGB offers a rubber plug, doesn’t seem correct for a threaded fitting. Appreciate your response.
Hello Tom,
I received a reply with a picture of the plug. Just waiting to find where he found it. Thanks for your reply.
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I think I found my plug at a well-stocked hardware store and ground it down a little to fit. And yes, Craig, that is the port we are speaking of - at least the one I was talking about.
Thank to ALL who helped me with vacuum problem. Today I found a proper fitting from a local hose supply company who carried BSPP.
If anyone in the future has this need ask for “blanking pug 3/8-19 bspp”. Make sure it is parallel thread bsp(p) and NOT bsp(t) which is tapered.
Bob W