Just reassembled a 3.0L SC pump the other night. I cleaned the threads with brake cleaner and used new nuts, new spring washers, applied blue loctite. Using my handy dandy 3/8 drive snap-on dial gauge 0-300 inch-pound "torquometer" torque wrench, I torqued them to only 100 inch pounds (8-1/3 ft-lb). Initially, one of the old nuts seemed like it was stripping, so I used some new ones. Even with the new nuts, one of the studs could take no more than 100 in-lbs. The nut was turning, the stud was not turning and the dial would continue to wiggle at 100 in-lbs so I stopped there.
You don't want to overtighten the nuts and distort the pump housing. I'm comfortable with 100 in-lbs since its near the torque spec for M6 coarse thread fastening of a class 8 nut. Actually too tight, considering my threads were lubricated with loctite
http://www.metricmcc.com/catalog/Ch10/10-1027.pdf
Nonetheless, I checked the pump and it spins freely with no clicking or feeling of contact/rubbing within the pump housing.
Me no needy a stretched timing chain. Already got a couple of old worn chains in the scrap metal pile thankyouverymuch
