KB olds Blown alky engine. #1 and #7 crack every race around the bottom outside where they are welded to the flange. I have tried Bronze and mild steel filler. I have clamped the flange down while welding and tried without. Ground out the old cracked filler rod to get to closer to the flange material. (they have been welded a lot). Got some slow mo video of the headers and they move a LOT when the cylinders fire. Not sure if I should try some gusset plates on the bottom I have seen that on some or if that will just give me another spot that will crack. Not sure I can even buy flanges for the old AJ alky olds heads? Anyone know of a weld up kit for this application? I have not called any header companies yet.