head dead??

Ok so firstly a little background story.. my tf 160 has just popped its gasket 15 months after a head re-build!!! :dunno::dunno: she has been my daily hack for 5 glorious years.. my better half has a zr .. we are in the process of getting her a new motor in order to semi retire the tf (weekend warrior) so we are sharing the zr... there was a tapping on the top end so I though hmmm tappets = oil change.. did this Sunday.. success.. no tapping drove great on test run. Monday comes around get dropped at work all is well.. 20 mins later I get a call the zr is running like a bag of spanners. Turns out the bloody thing has spat a plug and stripped the thread...?????? Tried a plug in there push in pull out..



Can the head be re threaded or is it scrap?? What would cause this?



Luckily I have a spares car that I can use the head off.



Any ideas guys n gals? :angry:

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