you can weld it,
but cast iron is so brittle,
literally the weld will pull against the cast iron and cause other cracks.
if you do weld it you need to use nickel rod, and you need to tap the area you weld with a ball peen hamer or a pnuematic tapping tool.
because turbine housings can reach temperatures of over 1600 degrees continuous,
there really isn't a sealant that will fix your issues.
i woudl just spend all of 60 bucks on a used 13g turbo.
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