cc heads and pistons

Im having issues cc'ing Indy EZ-1 heads and ICON pistons. I "tried" to cc my heads using a ml baby syringe and my heads came to 65ml which = 65cc. Im suppose to have 74cc's. So I cc my 16.4 dish ICON IC839 mopar stroker pistons to double check and they come out about 10ml = 10cc. So I'm in a dilemma.

Im just double checking everything before assembly. My theory is Check 2wice build 1nce, check 1nce build 2wice...