cylinder head bolts is stripped

[SledEd77]

Was torquing the cylinder head bolts down to the recommended spec, when all of a sudden I had felt like it snapped at the same time my torque wrench makes the clicking noise when it at the desired torque. It felt like it was tight. The other day I noticed antifreeze coming out of the bolt so I removed all the bolts assuming that the bolt would be broken under cylinder head cover but much to my surprise it is not broken. So I ran the bolt through my die, I wanted to run the 8mm x 125 tap through the hole, but of course I can't find the Dam thing. So anyway I tried putting the bolt back in with some thread locker but it is still doing the same thing. It's like the threads are screwed up way down in the hole. So I am not sure what I should do. Try tapping it to a 10mm bolt or 3/8 " bolt which is closer in size to the 8mm when using the right size drill bit. I could probably get away with not having to drill the hole using a 5/16" drill bit before running the tap. Either way I go about doing this, it would be nice to get some advice or someone who has ran into this problem before and knows how to fix it properly. Thanks in advance

 

[LoudHandle]

Your best bet is a helicoil insert or a time sert (timesert is one piece rather than a coiled diamond shaped spring, time sert also has the last thread or two undersized so when it is set it expands to help lock it in place ( in addition to the permanent (red) loctite).

This usually happens from not getting the coolant out of the blind bolt holes. It causes hydraulic pressure and pulls the aluminum treads, as they are the weakest link at that point. Qtips or some compressed air to dry out or blow out the coolant. Qtips are the cleaner choice. Especially if you only dropped enough coolant to do a head swap.