What is the smallest depth of hole that you can install a Helicoil into? As i have a Soul Destroyer, basically a DS billet engine with MMR porting and the threads in the top of the cylinder keep stripping as as i'm sure you know the metal the heads are made out of it rather soft and easy to pull the threads out of. I'm hoping to have Rob @ IRC install a helicoil (of course if he doesn't mind into each of the small M4 holes that hold the heat sink to the cylinder. Would this be possible, bearing in mind the holes are only around half a centimeter deep.
Cheers lads and lasses!