I agree with Beemer. I always use blue locktite and they have never backed out at all. I've never used a pipe to get them tight. I however have used a pipe or two trying to get them out
Overtorqing the bolts will make them weaker and hurt their tensile strength.
On a side note, when I bought new bolts from Ford, they had a thread selaer on them already.
JMHO.