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I TIG weld alloys all the time and the issue is: It's oil soaked and aluminum alloy tends to soak up the oil and so you cannot TIG it unless you remove all the oil from the 'pores' of the alloy and that can be pretty complex and time consuming as in repeated 'baths' in various non contaminating...

Too big of a crack to TIG. Replace it.

If it's a Jinma, the valve cover is pressed steel btw.