Is this a higher Magnesium/Aluminum Alloy?

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I tried welding these -10AN bungs on a 2jz valve cover, and things went horribly wrong. It's certainly not my first time welding cast anything, initially I though it was just really dirty aluminum, but after 6 passes of trying to fill it in and grinding it to clean the impurities on the surface of the weld, it kept on bubbling away. After giving up on that, I called the customer and told him that I couldn't weld it, so I opted to machining bungs that would have a very tight press fit on them That has worked out just fine. But I'm just here to see if my hunch is right.. the only time before that that I tried welding anything with a higher magnesium content, the weld would keep on cracking right in the center as it normally would, but this just kept on puffing away... Let me know your thoughts, I did AN fitting in his oil pan piece, and that worked out just fine. I've attached a picture of that to show my welds on cast. Also I had to resort to my worst enemy (jb weld) to fill in the gouge that it had left in the cover, as I need to powder coat it afterwards. Attached Images