I take a more contemporary approach for the valve seat issue by using aluminum heads with hardened seats and stainless valves (bronze guides and Viton seals, as well) already in them. These are the materials you really want. And did I mention, modern engines have them as standard fare?
Both engines you cite have hardened exhaust seats installed (because they need them). The FE Forum has extensive discussion on this subject (CLICK HERE) and I have pictures of 390 FE heads that clearly show the exhaust valves are dangerously recessed into the heads. I gladly gave the original iron heads to the sheeny man who was looking for scrap metal on garbage day. - Dave
Both engines you cite have hardened exhaust seats installed (because they need them). The FE Forum has extensive discussion on this subject (CLICK HERE) and I have pictures of 390 FE heads that clearly show the exhaust valves are dangerously recessed into the heads. I gladly gave the original iron heads to the sheeny man who was looking for scrap metal on garbage day. - Dave
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