The JE/SRP site lists 'dome volume' and they list -5 cc's for these pistons; the - sign means 5cc's of ADDED combustion chamber volume due to the piston eyebrows. The KB site will list the same number as +5cc's of 'head volume' for the same ADDED combustion chamber volume due to eyebrows. The DCR calculator you use will have to have the right polarity of volume added (eyebrows on flattops) or subtracted (domes). You are probably using a DCR calculator that needs a + number for proper results for eyebrows, and would use a - number for reduced combustion chamber volume for domes. But we don't know what DCR calculator you are using.