Interesting articles on the 273 engine

mvh said

I had hardened valve seats installed in my current set, but I haven't run them yet. The valves were extremely recessed in these heads, making it mandatory. My car would get a lot of miles (if it ever gets back on the road).

There really isn't any option to run larger valves in the 273 because it's limited by the small bore size.

That 275HP motor mentioned was the "D-Dart" drag racing special. Very limited production. The street Commando was rated at 235HP.

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Thanks very much for the information. That is gold to me. I understand all of what you are talking about. I guess the one thing that can be done would be to help the flow by porting the heads and/ or port matching if it is necessary and can be done. I think we, as car guys have a tendency to want to squeeze every bit of power out of an engine that we can. One thing I have read and saw about Chrysler is they weren't afraid to make some radical designs in their engines trying to get the most power from them. One thing that has kept me interested in Mopars all of these years. Again, thanks for your input.