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If you see cracks in your headers, just have someone fill the crack with a bead of weld. This will probably happen several times, but is easily fixed by your local mechanic and should be very cheap.
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Prior to welding, clean the header coating from around the area and drill a small hole (1/16" or so) at each end of the crack to prevent it from spreading. It's important that the crack actually ends in the hole, so be sure you have located the ends. This eliminates the stress risers at the ends of the crack and allows the welder to achieve full penetration at each end of the repair.
Lowell