The exhaust wasn’t really noisy but believe it or not the Speedmaster Head was much quieter. Not sure what valve angles but since they were out of the box I’m betting you are right. The seats were lightly rusted and I cleaned them up with transmission fluid and gray fiber cloth. The other shop north of me assembled the heads, blued them, and lapped them in. To me the exhaust were pathetic and even the intake ports were to jumpy and wouldn’t go on my engine that way.
