Manifold bolts should not be over- or under-tightened, so use this type of wrench with a foot/pound scale
... Use 
a 2-foot-long wrench and apply 50 pounds of force, and you'll .... Circular patterns 
of bolts, typically the lug nuts on wheels, should be tightened not in... [DOC] [TLE] how can I calculate Torque when tightning bolts - Bimmerforums [PAR] Apr 14, 2008 ...