Hi John,
Your memory is good. The thread is 7/16-20, and 1/4 or 3/8 long socket
head set screws do a nice job.
John
Fogelsville, PA
Deikis, John G wrote:
> I want to put allen head plugs into the abandoned emissions air pump
> ports in a de-smogged 1275 head.
>
> I seem to remember they are threaded 7/16-20 UNF but am not sure.
>
> Can someone verify for me what will thread in there, or will I need to
> drill and tap to another size.
>
> The last time I did this, the head I was working on was not in the car
> and I neatly closed up the ports with nifty Allen set screws or pipe
> plugs that fit flush and don't look "cobbled."
>
> Suggestions?
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