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Re: leaking headers
some times if you separate each runner from the others at the head flange by cutting out the section of the flange between runners. you can minimise and even eliminate the effect of warping.and if only one runner/flange is warping it does not influence others.
its the heat that warps them. it also causes hardware to loosen up. when that happens people will go in and snug the hardware up, often while the header is too hot to touch.
wait until the header is cool to the touch, torque it properly, and use safety wire on your hardware to maintain that torque. If it is found to have loosened up, back the bolt off, retourque it and safety it up. done right, eventualy the header will stabalise and the bpoblem will go away. crank on it wrong and not only will those problems remain but improper torqueing on hot parts will cause several other problems as well.
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