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Percy's Seal-4-Good gaskets are highly regarded, they're made out of a thick dead soft aluminum that compresses to conform to the flange and head surface. With square ports, maybe the 66012 part number would be what you want.
I recently installed headers but gaskets blows
L98 aluminum heads square ports
whats is the best option ?, copper, xx carbon,graphite, stainless
Use a quality aluminum gasket, I've had nothing but problems with copper gaskets on aluminum heads.
I use remflex gaskets and only have positive things to say plus they have a lifetime warranty.