I myself am not a big fan of helicoils and/or inserts. Back in the day I had an Allis Chambers Terra Tiger (6 wheeler) with a JLO Rockwell engine in it. A buddy was helping me with some engine work on it, he over torqued the plug and stripped it. I went the helicoil insert route, it was done right, tapped, measured and all that, and it lasted a day. On these machines the engine sat straight up and was literally between your legs and you leaned over it to grab the handle bars. (Yep, Terra Tigers were the only 6 wheelers I ever saw with handle bars instead of control levers, but I digress! lol) Anyway a spark plug zinging right past my chin at full compression was enough to for me to whip out the old Traders Guide and start looking for JLO engines for parts. I say if your gonna pull the head anyway to do the helicoil insert, just replace the head.
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