correct exhaust manifolds

hope these hints help. 1. use anti-seize compound on ALL threads. 2. tighten manifold bolts to 70-80% of full torque, at first. after 4-6 full heat cycles take to full torque. 3 be sure manifold flange bolt holes have the full size dia bolts. an under size bolt will get loose. my slant 6 was to have 11/16 bolt but a 3/8 would get loose.