Need help with valve covers leaking

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unless # 2 header tube is right against the valve cover! "big block, raised port, TTI 2" headers" , have burnt up evert type I`ve tried. Rob, your working in a parts store aren`t u ? if so, does anyone make an asbestos type valve cover gasket for a 440 ?? I don`t have room to shim the header out. thinking, pulling it of and eggshaping the tube might be the only way, dang it !

Could you fab a thin aluminum heat shield that bolts to the valve cover bolts