Finished up the manifold. No cracks so far... I pre heated to ~450F with a rose bud. Tig welded with 1/16" SS filler rod. Post heated. wrapped up if I ever need to do anything like sharpening the tungsten. It welded up pretty good, meaning no real issues with cracking, or junk coming up through the puddle. Have some exhaust bends ordered up to finish it up.