Changed the spark plugs and found that the screws holding in the coil packs were not working. A PO had stripped the thread in the head.

My question is, should I leave things alone or put in an appropriate helicoil insert in the head. Would there be enough meat in the head to take a helicoil?

Suitable precautions will be taken when drilling and tapping; tape over the spark plug holes, vacuum cleaner during the work.

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