The bolts torque/stretch is really supposed to do the work of holding the components together, if you're relying on the Loctite to hold it together you gotta wonder why....I use loctite as a measure of insurance so blue should be sufficient on most bolts, I've seen more dampenerer bolts come loose than flywheel bolts but I'd sure never put red loctite on one....

I don't think I've ever seen blue come loose on a NEW bolt that had been PROPERLY cleaned, prepared and torqued to the right spec. Reused bolts are another matter that's why I don't reuse bolts in critical areas.