I thought headers get torqued from the inside out?well like jack said. nice and tight would do but do a star pattern, like wheels. Go over each bolt a few times... what you could do is start at a low torque go through a few times go higher 5 ft lbs again and last 5 lbs higher. its not in any manual but if it works for the hubs of my airplanes, trust me it will stay nice and snug. I bet this sounds rather odd. enjoy!
I think thats what he meant. But to start for example if the TQ spec is 40 ft lbs to start at like 25 do the back and forth pattern starting from the middle and go to the edges of the head then go back and tighten to 35 lbs and then go bak and do the final tighten to spec.I thought headers get torqued from the inside out?