[urq] Manifold O2 sensor thread stripped

[lawson.d at comcast.net]

> 
> The threads on the O2 sensor hole are completely gone on my 1983 Ur-q 
> manifold. I need some advice on the best way to correct the situation: 
> 
The stock urq WX engine O2 sensor is mounted in the down pipe not the exhaust manifold. I would just weld on another sensor bung, these are available from 034 motorsport and probably other places. 
- 
Dave