I will be welding 6061 fuel injector bungs onto a cast aluminum intake manifold.

Are there any tricks in doing this?

I have not tried something like this, nor have i done much aluminum welding. I am working on getting a BUNCH of stuff to practice on. Do have a few extra cast aluminum manifolds to practice on, just need to get some material to weld to it.

Thank you for your input.
Scott

EDIT: will be using a tig welder. 4043 filler rod work ok for this? It seems to be the most common filler rod out there.