Haha, madjap, using the wrong divining rods.
This'n requires dangling a calculator from a piece of string.
If you do it in millimeters:
Bore * Bore * Stroke * Pi/4 = Displacement of one cylinder in cubic millimeters
To get it in Cubic Centimeters, divide that mess by 1000
Ex:
Bore (2nd over) = 75.5mm
Stroke = 74mm
Pi/4 = (3.14159 / 4) = 0.7854
75.5 x 75.5 x 74 x 0.7854 = 331296.2, then (divided by 1000) = 331.3cc
Thats for one cylinder. Multiply by 2 to get total displacement = 662.6cc
Compression chamber volume is not included when calculating displacement...