Direct Connection Big Block Valve Covers (Rare)?
Stamped aluminum seal fine if you use the right gaskets and don’t over tighten them. You have to pay attention when installing, and not tighten them as if they were steel of cast, just thinking you can crank the bolts tighter. I’ve got Moroso gold anodized vc’s and use Mr Gasket Ultra Seal gaskets. Not a drip. YRMV