identifying heads for 273

bamacuda said

I have a 273 commando with the domed pistons and 10.5:1 compression. I am trying to reduce the compression. It has been suggested to use swirl port heads. My questions are: 1) what will this do to the compression? 2) Are these heads visibly different when installed? ( mine is the 65 with the different bolt angle, how do I deal with that?

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Why are you reducing compression, does it ping? Have you cc'd the head and dome to find actual compression?

At work we've milled the pistons down on engines a few times. Have to balance it though, because of lighter pistons.

You would need to redrill or cut the intake bolt hoes, or use a different intake.