Armen, that is exactly what I did.  I calculated the volume of a cylinder 3.819" diameter, .095" tall.  Then I compared that to the measured volume of oil.  That measured volume included one additional cc of valve relief volume.  Then I compared one value to another.  

The geometric calculation of the pop-top was 6.5 cc while the direct oil measurement showed 7.3 cc.  It was an 0.8 cc difference.  Since the pop-top has beveled edges I felt that the geometric calculation was less accurate so I used the direct measurement with oil.  Subtract the volume of the reliefs (1 cc) and you end up with 6.3 cc.