sorry we are both off just a bit.our v10 is 6.8 l or 6800cc div by 415 our ci's=63.85 ci per liter give or take .i'm to old for this just give me c.i's and i'm a happy camper, i've always used 60 as a round about worked for me close to. don't want no flame wars here. to old for that to. how about a draw?