I still feel that the Helicoil is the best way to go as it'll be stronger than straight alloy thread. Just don't go too silly with the tightening of the head bolts as you only have the short Helicoil threads and not the longer variants.

Cheers,
BB.

I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.