Well, that was a FAIL! Weld looked nice but did not adhere. Ground it flat, hit the edge of the manifold and the cracks appeared. Well this is why we test
Did the first pass over an inch, too much probably. Next test will be 350 deg preheated, only 1/2 inch passes, then stress relieve, then back in the heat. Also instead of 75% Argon, I will be going full Argon and bumping up the heat range of the welder.