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Deleted member 214
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All cast valve covers leak. When you use stainless Steel fitting they make it worse. You need a washer under the heads of allen Bolts. I would get a et of Cometic gaskets. Use their glue or install with 3M Yellow Adhesive. No matter what you do with Aluminum covers they will leak with headers so close. The heat draws the oil out.
Mine never did. Used aircraft gasket cement and stock gaskets.