At the first track day of the year and my O2 popped out, stripped. What thread is the sensor hole I need to locktite a screw in place.

 

M18 x 1.5. Same as some spark plugs.

 

Oh I'll by a metric plug in case I need it. Thanks for the idea. I'm at the super Walmart looking for loctite and a wire to run through a bolt I borrowed so I don't lose it on track. I think the bung is boogered too because the bolt was M18 and now is a bit rounded itself.

I'll pull the exhaust and chase the thread next week. With straight exhaust and no O2 I'll run rich tomorrow oh well.

 

Most spark plugs are M14 x 1.25.

All O2 sensors are M18 x 1.5

 

autozone has drain plugs that will fill the hole,
and it is a 18 x 1.5