OK Maurice. I'm happy to have a friendly debate on the subject some more. I purchased a complete stainless system for my Dad's Jag. XJ6 some years ago and shipped it to him in Zimbabwe! The company even told me the grade of stainless, but I've forgotten now. I would have thought that the exhaust port area of a cast iron side valve engine to be just as hot as any manifold. More research needed I feel. Regards Ron
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