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You are being ' squishy ' with your wording...and need to tighten it up..
I said in the other thread that ' engine size' is the area swept by the top of the pistion.
That compression is the total combustion chamber volume .. that piston sweep PLUS the amount of space above that ... the max at BDC compared to the total at TDC gives the compression ratio...
but your question about the volume of the head itself... ( assuming some dome ) is that you take it off and turn it upside down.. and titrate water into it... measure the amount of water in the container before dripping into the head... and subtract... ...
This is how equal volumes were produced in race engines.... metal was ground off safe areas until all the head volumes were equal.....
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