I don't know what the torque should be but did you torque them in a sort of star pattern like you would for head bolts or lug nuts?

__________________
1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?