Valve cover bolt diameter - Heli Coil help

BOPOH

Explorer
Hello,

I noticed oil leak from valve cover and found that bolt wasn't tighten, actually almost half way out. i tried to screw it back to 4 in-lbs and the bolt kept going, it was like threads didnt hold it tight enough. I suspect that who ever did valve cover gaskets before over tightened the bolts. Now i'm planning on using Heli-Coil but i dont know what bolt size it is and what kit to buy. Have anybody done this before? any suggestions?

Thanks
 

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