o2 sensor plug needed

[gforbess at attglobal.net (Gordon Forbess)]

On Mon, 4 Oct 2004 10:04:14 -0400, George Herndon
<gherndon@eyeontech.com> wrote:

>i installed my new TT 2.25" exhaust this weekend, replacing the ansa 
>model that was not emissions compliant here in NC.
>
>my car is a '78 with a race header that is a 4 into 1 design with a 
>bung for an o2 sensor located near the flex joint and cat (unknown 
>design).  a visual inspection of the opening shows a fine threaded nut 
>in the 3/4" range. my calipers say ~ .74
>
>the autoparts store has bosch o2 sensors for an '81 and it looks to 
>have course threads.
>
>can anyone shed light on if they've ever encountered a fine threaded o2 
>sensor bung?
>
>ideally, i'd like to plug it, in case i need an o2 sensor in the 
>future.  i could always weld it closed and forget it.

To plug the O2 sensor hole in my header I used an aftermarket oil
drain plug I found at a FLAPS.  18 X 1.5 thread, I think.

Gordon

75 Mk I/Drake 1.9
http://pws.prserv.net/gforbess/scirocco/scirocco.htm