I have read that the B16, throughout its versions, had compression ratios: 10.2:1, 10.4:1 , and 10.8:1.
I read that the difference between 10.2 and 10.4 was the pistons...I will assume the actual volume of the head's combustion chamber remained the same.

When we get to the 10.8:1 units, the B16B.....was the higher compression still a result of still higher domed pistons, or was there a difference in the volume of the head's combustion chamber?

And on that note, what was the volume of the head's combustion chamber-and was it the same between all the compression ratio variations?

Thanks in advance!

 

https://zealautowerks.com/bseries.html

 

From clicking on the link it appears different dome and comp height. I've never heard of any B16 heads having different CC volunes. The only differences I have heard of from head to head is valvesprings/cams/valves, and of course the type r's being ported.