After I diagnosed a blown out spark plug in my customer's car, he went out and bought a "Save-A-Thread" kit containing a thread tap with 3 different length heli coils (also called a time sert) to slightly open and re-tap the existing spark plug hole. The heli coil or time sert which matched the length of the spark plug threads, was screwed and locked into the tapped hole. Once locked in place, the the threads inside the coil or sert, matching the threads of the spark plug, allows the plug to be torqued back into the cylinder head without coming loose.

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Parts & Specialty Tools:

Heli-Coil Multi Helicoil 5334-14 Save Thread Repair Kit M14 x 1.25:
https://amzn.to/2UDLHCw

Permatex 82194 Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker
https://amzn.to/2HGs6xG

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