Hot Rods Intake sealing

I've got a Edelbrock 557 that seams to have some porosity in one of the water passages, what can I use to coat the inside so I can run it? Any help would be greatly appreciated!!
Thanks!!


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Can u get the JB Weld over there. Great stuff. Just mix a small amount of equal parts together. Fill your pitts and smooth off with a sharp blade. Sets over night and lasts forever. Your weldit could be similar stuff.