...I will measure chamber cc's, I was told break fluid is good for this purpose.
If I use it and get no leaks down the valves, is "sealing" ok, or that doesn't mean much because there's no pressure...
Brake fluid is expensive and corrosive. I usually use kerosene or diesel fuel and maybe a little automatic transmission fluid for color. I mean't so you could check the seal on the valves with the seats without taking the heads apart. It is a rough check but works pretty good.