what are the best all motor heads?

[2FastLX]

For what it's worth, I work in a machine shop making jet engine parts day in and day out. We work with aluminum a lot. The only reason aluminum is heli-coiled (we use key-serts which are better) is for repetitive bolting and unbolting of parts together. The aluminum threads will hold up just fine as long as you don't get crazy with over torquing and strip them out. I think the TFS quality issues have all been resolved long ago, but I still have heard people who have used both swear by AFR.

And the reason people have had problems with heli-coils pulling out of the AFR heads is probably because they had bolts that were too long and were bottoming out in the holes which would easily pull the heli-coil out. Just a guess.