I give up. Everything checks out. As far as I can tell. And while dorking around with the new jet and burner tube I broke the gas line to the pilot. Ugh.
Thinking I should cut my losses and just order a new water heater. It is beyond me.
By the way. Before breaking the gas feed tube I got the main jet aligned like a pro. It fits and slides and aligns perfectly. Light it up and still getting the blow out flame.
Anybody want some barely used new parts????