one stripped head bolt - get girdle head or helicoil?

If it makes any difference, its a non girdle Riva head 175psi. I've had one other experience using helicoils... Should I be concerned about drilling into the bolt hole given the thin cylinder wall?
Thanks in advance for the help!
 
If it makes any difference, its a non girdle Riva head 175psi. I've had one other experience using helicoils... Should I be concerned about drilling into the bolt hole given the thin cylinder wall?
Thanks in advance for the help!

I heli-coiled all of my holes, no problems here.
 
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