Trick Flow heads - thread inserts?

Do the TF heads come with thread inserts (Heli coil)?
If not would you add them to all/some bolt holes (exhaust, Intake, rocker shaft, valve cover)? I think I'd go with Time-Sert inserts or E-Z Lok instead of heli coils.

I wouldn't do any unless needed, I checked all of my threaded holes with thread go/no go gages and all were spot on for sizing, everything went together as expected, appropriate thread lubricant is suggested.

I agree with dartman, lube threads, all good.

Alright, I'll leave it as is then. Reason I'm asking is that I know a guy that does it to all bolt holes on aluminum heads as a precaution.