Ol'55,
Took a while to see if we could get another answer/opnion, but as long as no one showed up, here are some more 0.02 about it:
I've been assembling engines as for living for a long long time(nearly 20 years). Since I work basically with american made engines, I traveled sometimes to the U.S. to learn with some cool fellows that do not mind sharing their knowledge, and also got a ton of books and manuals to learn how to make my job right the first time.
One thing to be seriously considered is the fact that what keeps the nut/bolt from getting loose and falling apart is the fact that the tightened element suffers a programed elastic deformation, and within the proper limits this elastic deformation holds things quite well. And of course the fact that the required torque for the nuts/bolts consider the presence of oil and the oil normally has a constant drag coeficient, loctite has another specs. get for example a set of ARP bolts, they do furnish You the required torque using oil and another for themoly lube they do furnish, and they are completely diff.
Sometime ago there was a very good article on Mopar action covering this subject, and of course they stated the best way to measure the right amout of torque to a bolt was the stretching method. The deal is that it is not possibleto all bolts. The one You asked, for example, is not possible to be measured.
Now my personal opnion: I do use loctite in engine assembling except for one aplication: I understand that the 3 small bolts that holds the cam in all chevy V8 engines and in big mopars. They are quite small, 5/16 NC, and require 25 foot/pound of torque. The fact that all these bolts rupture at near 30 foot/pound leaves li'l margin for error. So I see clever to use the red loctite (271) and torque them to 25 pouds. Except for this case,I do not use it. Although for some non-critical aplications such as holding carb studs to aluminum manifolds, transmission locking bolts in a complementary way to the locking wires and so on. This is based on the info and comments I got from others that do know muchmore than I do and the fact that my personal experience and lack of failures for this long period of work leads me to think I'm in the right way.
Best Regards,
