Installed a new thermostat on the g35. When I went to put everything back together, I noticed that the thermostat housing bolt hole at the bottom is "slightly" stripped. I say "slightly" because it can be snugged up to where it cannot be moved by hand but not tight enough to keep a tiny bit of coolant from weeping out around the gasket at that end of the housing when the engine is running. The other 2 bolts is fine BTW and can be tightened down nicely. Is using a heli-coil or perma-coil to renew the bolt hole the best solution or is there some other way of fixing this problem?

thanks for the help

 

You got it. heli-coil is probably the most 'correct' option.